A steel structure argon arc welding device and method

Abstract

The present application relates to steel structure welding technical field, disclose a kind of steel structure argon arc welding equipment and method, the steel structure argon arc welding equipment includes welding machine frame and is located on the welding machine frame welding head, copper backing plate, argon gas supply cylinder, control panel and welding power supply, copper backing plate is fixedly installed in the steel band insertion seam in the upper portion of welding machine frame, copper backing plate top is equipped with centering guide fixing mechanism, centering guide fixing mechanism side is equipped with self-adapting slit guide mechanism;The equipment adopts self-adapting slit, through finding zero drive hand wheel torque limiter drive bidirectional adjusting screw rod to make both sides concave frame synchronous relative movement, two steel band end surface contact after torque limiter automatic slip establishes zero reference, through the roller detection steel band thickness of self-adapting rotating frame, gear transmission mechanism drives bidirectional adjusting screw rod reverse rotation, will slit gap accurate open to the target value matched with thickness, without manual measurement and adjustment, effectively improve weld forming quality and penetration rate.

Description

Technical Field

[0001] This invention belongs to the field of steel structure welding technology, and specifically relates to a steel structure argon arc welding equipment and method. Background Technology

[0002] Argon arc welding, or tungsten inert gas welding, is a welding method that uses an electric arc generated between a tungsten electrode and the workpiece as a heat source and argon gas as a shielding gas. In steel structure production, especially on continuous steel strip production lines, argon arc welding is widely used for butt welding of steel strip ends to achieve continuous production. The quality of steel strip welding directly affects the smooth progress of subsequent rolling and annealing processes. Insufficient weld strength or defects can lead to strip breakage and production stoppage, causing significant economic losses. In the process of butt welding of steel strips using argon arc welding, the positioning of the butt joint is a crucial step in ensuring weld quality. When butt welding steel strips, the ends of the two steel strips need to be aligned and an appropriate butt joint gap maintained. Simultaneously, the weld must be precisely aligned with the forming groove in the center of the copper backing plate to ensure good weld formation and uniform penetration on the back side.

[0003] When welding two sets of steel strips of the same thickness, different gaps are required for each thickness. Thinner steel strips require smaller gaps to prevent burn-through, while thicker steel strips require larger gaps to ensure full penetration. Existing equipment typically uses manual adjustment of the spacing between the guide blocks on both sides to set the gap. This method is inaccurate and time-consuming. Some equipment uses a digital control scheme with servo motors and displacement sensors for adjustment. However, in strong electromagnetic environments, digital control schemes are prone to signal interference, false triggering, and even damage. Other issues include metal spatter and high-temperature metal particles adhering to the optical sensor mirrors and causing malfunctions, and welding fumes clogging the gas path of precision sensors or covering the optical windows, all of which can lead to abnormal adjustment results. Furthermore, existing equipment often adjusts the guide blocks on one side or both sides independently. During the adjustment process, the weld center is prone to shifting, making it difficult to ensure that the weld is always precisely aligned with the center groove of the copper backing plate. If the weld is off-center from the groove, it will result in poor weld formation on the back side, with excessive weld beads on one side and incomplete penetration on the other side. In severe cases, the weld may even stick to the copper backing plate, affecting the subsequent processing and use of the steel strip. Summary of the Invention

[0004] This invention provides a steel structure argon arc welding equipment and method, which solves the technical problems in related technologies, such as low accuracy of manual adjustment of the gap between steel strips of different thicknesses and difficulty in aligning the weld seam with the center groove of the copper backing plate when welding two sets of steel strips of the same thickness.

[0005] This invention provides a steel structure argon arc welding equipment, including a welding machine frame and a welding head mounted on the welding machine frame, as well as a copper pad, an argon gas supply cylinder, a control panel and a welding power source. The copper pad is fixedly installed on the upper part of the welding machine frame, the welding head is located above the copper pad, a centering guide fixing mechanism is provided above the copper pad, and an adaptive seam guiding mechanism is provided on one side of the centering guide fixing mechanism. The upper part of the welding machine frame is equipped with a steel strip insertion slot, and a copper pad is located on the bottom surface inside the steel strip insertion slot. The copper pad is symmetrically equipped with two sets of T-shaped grooves, and the T-shaped grooves are fitted with a centering guide and fixing mechanism. The centering guide fixing mechanism includes a slide, a guide ramp, a concave frame, a pressure plate, and a pressing cylinder. The concave frame is fixed to one side of the slide by an L-shaped fixing plate. The guide ramp is welded to the inside of the concave frame. The pressure plate is fixed to the output end of the pressing cylinder. The pressing cylinder is installed at the top of the inside of the concave frame. The pressure plate and the bottom of the inside of the concave frame are set opposite to each other. The adaptive seam guiding mechanism includes a fixed crossbeam, an adaptive rotating frame, a transmission side frame, a gear transmission mechanism, and a seam adjustment mechanism. The seam adjustment mechanism is equipped with a bidirectional adjusting screw. A T-shaped plate is fixed on the back side of the symmetrically arranged concave frame. The two ends of the bidirectional adjusting screw pass through the T-shaped plate and are threaded together.

[0006] In a preferred embodiment, a central groove is formed in the center of the copper pad along its length, and a cooperating rod is installed between the slides arranged along the length of the copper pad. The bottom end of the slide is fitted with a T-shaped slide groove and slides together. The guide slope is a right-angled prism structure, wherein the inclined surface faces the steel strip insertion entrance, and one side of the pressure plate abuts against the side edge of the guide slope, and the two are arranged perpendicular to each other.

[0007] In a preferred embodiment, the top of the welding machine frame is provided with a welding port, and the fixed crossbeam is suspended and fixed inside the welding port. The transmission side frame includes a main side frame and an auxiliary frame, the tops of which are respectively connected to the two ends of the fixed crossbeam, and both are provided with adjustment grooves on their inner sides. The lifting slider is fitted inside the adjustment groove, and the top of the lifting slider is connected to the top of the adjustment groove through a spring.

[0008] In a preferred embodiment, the adaptive rotating frame includes a rotating main shaft, a hanger, and a roller. The two ends of the adaptive rotating frame are fitted with lifting sliders and rotate in cooperation. The hanger is fixedly connected to the middle of the rotating main shaft. The roller is nested in the lower end of the hanger and rotates in cooperation. The bottom end of the roller abuts against the top surface of the copper pad.

[0009] In a preferred embodiment, the auxiliary frame has two limiting holes on its outer side, corresponding to the upper and lower parts of the adjustment groove respectively. The limiting holes are fitted with limiting pins. The lifting slider has a positioning insertion hole on its back side. The auxiliary frame has a hollow frame on its inner side.

[0010] In a preferred embodiment, the gear transmission mechanism includes a double-sided gear plate, a main shaft gear, a secondary shaft gear, a secondary shaft, a main bevel gear, and a secondary bevel gear. The double-sided gear plate is fitted with a hollow frame and slides vertically. The main shaft gear is fixed at one end of the rotating main shaft, and the secondary shaft gear is installed at one end of the secondary shaft. The two gears mesh on both sides of the double-sided gear plate.

[0011] In a preferred embodiment, the main bevel gear is mounted on one end of the secondary shaft, the secondary shaft is fixed to the copper pad by bearings, the secondary bevel gear is fixed on the bidirectional adjusting screw, the main bevel gear and the secondary bevel gear are engaged in transmission, one end of the bidirectional adjusting screw is fixed with a torque limiter, and the other end of the torque limiter is connected to the zero-finding drive handwheel.

[0012] In a preferred embodiment, the torque limiter includes a symmetrically arranged active friction disc and a driven friction disc. The driven friction disc is fixed to the end of a bidirectional adjusting screw. A slide rod is provided through the center of the active friction disc. A pressure-boosting spring is nested on the outside of the slide rod. One end of the pressure-boosting spring is connected to the back side of the active friction disc, and the other end abuts against a washer. An adjusting nut is provided on one side of the washer. The adjusting nut is threadedly engaged with the slide rod. A zero-finding drive handwheel is connected to the end of the slide rod and is located outside the welding machine frame.

[0013] In a preferred embodiment, the welding head includes a moving drive motor, a transverse lead screw, a transverse guide rail, a head frame, and a welding torch. The moving drive motor is mounted on the top of the welding machine frame. The transverse lead screw is connected to the output end of the moving drive motor and passes through the head frame with a helical fit. The transverse guide rail is located inside the welding joint. One side of the head frame is fitted with the transverse guide rail with a sliding fit. The bottom end of the welding torch is directly opposite the central groove. An argon gas supply cylinder is connected to the welding torch through a gas delivery hose. The welding power output end is electrically connected to the welding torch and the copper pad.

[0014] A method for argon arc welding of steel structures, comprising the following steps: Step 1: Steel strip feeding and centering guidance. Steel strip feeding and centering guidance involves feeding two steel strips of the same thickness into the steel strip insertion slot at the top of the welding machine frame. The ends of the steel strips slide into the inner side of the concave frame along the inclined surface of the guide slope. The guide slope guides and centers the steel strips from both sides, aligning the center line of the steel strip with the center groove of the copper pad. Step 2: Steel strip clamping and roller lifting and locking. The steel strip clamping and roller lifting and locking is achieved by the action of the pressing cylinder, which drives the pressure plate to move downward, pressing the end of the steel strip between the pressure plate and the bottom of the inner side of the concave frame, so that the steel strip and the concave frame form a rigid connection. After clamping, the steel strip moves synchronously with the movement of the concave frame. At the same time, the lifting slider is pushed upward to the upper part of the adjustment groove. The limit pin is inserted into the limit hole on the upper part of the auxiliary frame and the positioning insertion hole on the back side of the lifting slider, locking the lifting slider in the lifted position, so that the roller leaves the surface of the steel strip. Step 3, Step 1 – Zeroing and Establishing the Zero Reference: Zeroing and establishing the zero reference involves rotating the zeroing drive handwheel on the outside of the welding machine frame. The zeroing drive handwheel drives the active friction disc to rotate via a slide rod. The active friction disc drives the driven friction disc to rotate via friction. The driven friction disc drives the bidirectional adjusting screw to rotate in the forward direction. The bidirectional adjusting screw drives the two T-shaped plates to move synchronously relative to each other. The T-shaped plates drive the concave frame and the slide to move synchronously relative to each other along the T-shaped slide groove. The end faces of the two steel strips gradually approach each other. When the end faces of the two steel strips contact each other, the rotation resistance of the bidirectional adjusting screw increases sharply. When the resistance exceeds the set torque of the torque limiter, relative sliding occurs between the active friction disc and the driven friction disc. The zeroing drive handwheel spins freely, and the bidirectional adjusting screw stops rotating. At this time, the gap between the weld seams is zero, and the zero reference is established. Step 4, the second step – thickness-driven precise slit opening: After establishing the zero-position benchmark, stop rotating the zero-finding drive handwheel, pull out the limit pin, and the lifting slider moves downward along the adjustment groove under the action of the spring at the top of the adjustment groove. The adaptive rotating frame moves downward with the lifting slider, and the bottom end of the roller abuts against the surface of the steel strip. The thickness of the steel strip lifts the roller upward, and the roller drives the rotating main shaft to rotate through the hanger. The rotating main shaft drives the main shaft gear to rotate, and the main shaft gear drives the double-sided gear plate to slide up and down along the hollow frame. The double-sided gear plate drives the secondary shaft gear to rotate in the opposite direction, and the secondary shaft gear drives the main cone through the secondary shaft. The gears rotate, the main bevel gear drives the secondary bevel gear to rotate, the secondary bevel gear drives the bidirectional adjusting screw to rotate in the opposite direction, the bidirectional adjusting screw drives the two T-shaped plates to move synchronously in opposite directions, the T-shaped plates drive the concave frame and the slide to move synchronously in opposite directions along the T-shaped slide groove, the gap gradually opens from zero position, the double-sided toothed plate moves to the position determined by the thickness of the steel strip and stops, the gap is precisely opened to the target value matching the thickness of the steel strip, the thicker the steel strip, the greater the amount of roller lifting, the greater the rotation angle of the rotating main shaft, the greater the amount of movement of the double-sided toothed plate, the greater the reverse rotation angle of the bidirectional adjusting screw, and the larger the gap. Step 5: Welding head positioning and welding. The welding head positioning and welding is performed by starting the moving drive motor, which drives the horizontal lead screw to rotate. The horizontal lead screw drives the head frame to move along the horizontal guide rail. The head frame moves the welding torch directly above the weld seam, with the bottom of the welding torch facing the center groove. The valve of the argon gas supply cylinder is opened, and argon gas is delivered to the welding torch through the gas delivery hose. The welding power supply is started, and an electric arc is generated between the welding torch and the copper pad to perform argon arc welding on the joint of the steel strip. Step Six: Loosening and Unloading the Material. After welding is completed, the welding power supply and the valve of the argon gas supply cylinder are turned off, the cylinder is reset, the pressure plate is lifted to loosen the steel strip, and the welded steel strip is taken out from the steel strip slot. This completes the argon arc welding process of the steel strip.

[0015] The beneficial effects of this invention are as follows: 1. This invention first uses a zero-finding drive handwheel to drive a bidirectional adjusting screw via a torque limiter, causing the two concave frames on both sides to move synchronously relative to each other. After the end faces of the two steel strips contact, the torque limiter automatically slips to establish a zero-position reference. Then, the thickness of the steel strip is detected by the roller of the adaptive rotating frame, and the bidirectional adjusting screw is driven to rotate in the opposite direction via a gear transmission mechanism, precisely opening the gap to the target value that matches the thickness. No manual measurement or adjustment is required, which effectively improves the weld formation quality and weld penetration rate. This purely mechanical structure can adapt to electromagnetic interference, slag spatter, and dust and smoke at the welding site. It is lower in cost, simple to maintain, and fast in response, and has advantages over digital control systems. It is not a technologically downgraded alternative, but a specially adapted design for this type of special industrial working condition.

[0016] 2. This invention achieves synchronous and equidistant movement of the concave frames on both sides by adjusting the screw rod in both directions and threading it with the T-shaped plates on both sides. The center of the weld is always kept in the center position of the copper pad, and the weld is automatically and accurately aligned with the center groove. This avoids the problem of weld center offset caused by unilateral adjustment or independent adjustment of both sides, and ensures good back-side weld formation and uniform penetration. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the internal structure of the present invention.

[0019] Figure 3 This is a structural diagram of the welding head of the present invention.

[0020] Figure 4 This is a structural diagram of the copper pad of the present invention.

[0021] Figure 5 This is a structural diagram of the centering guide fixing mechanism of the present invention.

[0022] Figure 6 This is a structural diagram of the transmission side frame of the present invention.

[0023] Figure 7 This is a structural diagram of the adaptive rotating frame of the present invention.

[0024] Figure 8 This is a structural diagram of the main side frame of the present invention.

[0025] Figure 9 This is a structural diagram of the gear transmission mechanism of the present invention.

[0026] Figure 10 This is a structural diagram of the seam adjustment mechanism of the present invention.

[0027] Figure 11 This is a structural diagram of the seam adjustment mechanism of the present invention.

[0028] In the diagram: 1. Welding machine frame; 11. Steel strip seam; 12. Weld joint; 2. Welding head; 21. Moving drive motor; 22. Transverse lead screw; 23. Transverse guide rail; 24. Head frame; 25. Welding torch; 3. Copper pad; 31. T-slot; 311. Coordinating rod; 32. Center slot; 4. Argon supply cylinder; 5. Control panel; 6. Welding power source; 7. Centering guide fixing mechanism; 71. Slide; 72. Guide slope; 73. Concave frame; 731. T-plate; 74. Pressure plate; 75. Downward pressure cylinder; 8. Adaptive seam guiding mechanism; 81. Fixed crossbeam; 82. Adaptive rotating frame; 821. Rotating spindle; 822. Hanger; 823. Roller; 83. Transmission. Side frame; 831, Main side frame; 832, Auxiliary frame; 8321, Limiting hole; 8322, Limiting pin; 8323, Hollow frame; 833, Adjusting groove; 834, Lifting slider; 8341, Positioning insertion hole; 84, Gear transmission mechanism; 841, Double-sided gear plate; 842, Main shaft gear; 843, Secondary shaft gear; 844, Secondary shaft; 845, Main bevel gear; 846, Secondary bevel gear; 85, Gap adjustment mechanism; 851, Bidirectional adjusting screw; 852, Torque limiter; 8521, Active friction disc; 8522, Driven friction disc; 853, Zero-finding drive handwheel; 8531, Slide rod; 8532, Pressure boosting spring; 8533, Shim; 8534, Adjusting nut. Detailed Implementation

[0029] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0030] Example 1

[0031] like Figure 1 and Figure 2As shown, a steel structure argon arc welding equipment includes a welding machine frame 1 and a welding head 2 mounted on the welding machine frame 1. It also includes a copper pad 3, an argon gas supply cylinder 4, a control panel 5, and a welding power source 6. The welding machine frame 1 is a frame structure welded from structural steel, possessing sufficient rigidity and stability. A steel strip insertion slot 11 is provided on the upper part of the welding machine frame 1. The steel strip insertion slot 11 is a horizontally penetrating slit used for feeding and removing the steel strip. The copper pad 3 is fixedly installed on the steel strip insertion slot on the upper part of the welding machine frame 1. The inner bottom surface of seam 11 has a copper pad 3 made of chromium zirconium copper with high thermal conductivity. The welding head 2 is located above the copper pad 3 and is used for argon arc welding of the steel strip seam. The argon gas supply cylinder 4 is connected to the welding head 2 through a gas delivery hose to provide argon gas protection for welding. The control panel 5 is installed on one side of the welding machine frame 1 and is used to set welding parameters and control the operation of the equipment. The welding power supply 6 is located at the lower part of the welding machine frame 1 and its output end is electrically connected to the welding head 2 and the copper pad 3 to provide electrical energy for welding.

[0032] A centering guide fixing mechanism 7 is provided above the copper pad 3. The centering guide fixing mechanism 7 is used for automatic centering guidance when the steel strip is fed in and for clamping and fixing before welding. An adaptive seam guiding mechanism 8 is provided on one side of the centering guide fixing mechanism 7. The adaptive seam guiding mechanism 8 is used to automatically adjust the seam gap according to the thickness of the steel strip to realize the two-step adaptive seam.

[0033] like Figure 4 As shown, a central groove 32 is provided in the center of the copper pad 3 along the length direction. The central groove 32 is a U-shaped groove that runs through the length direction of the copper pad 3. It serves as a mold for forming the back of the weld, ensuring that the back of the weld is uniformly penetrated and well formed. Two sets of T-shaped grooves 31 are symmetrically provided in the copper pad 3. The T-shaped grooves 31 are set along the width direction of the copper pad 3 and are located on both sides of the central groove 32. The cross-section of the T-shaped grooves 31 is T-shaped, which can restrict the vertical displacement of the slide 71 and ensure that the slide 71 can only move in a straight line along the length direction without deflection or tilting.

[0034] like Figure 5 and Figure 10 As shown, the centering guide fixing mechanism 7 includes a slide 71, a guide ramp 72, a concave frame 73, a pressure plate 74, and a pressing cylinder 75. The slide 71 is a long strip frame structure, set along the width direction of the copper pad 3. The bottom end of the slide 71 is fitted with a T-shaped groove 31 and slides together. The slide 71 can move linearly along the T-shaped groove 31. A coordinating rod 311 is installed between the slides 71 set along the length direction of the copper pad 3. The coordinating rod 311 is a cylindrical rod, and its two ends are fixedly connected to the slides 71 on both sides. The coordinating rod 311 can ensure that the slides 71 on both sides move synchronously, improving the synchronicity and stability of the seam adjustment.

[0035] The concave frame 73 is fixed to one side of the slide 71 by an L-shaped fixing plate. The concave frame 73 is a U-shaped frame structure. The inner space of the concave frame 73 is used to accommodate the end of the steel strip. The guide slope 72 is welded to the inner side of the concave frame 73. The guide slope 72 is a right-angled prism structure, with the inclined surface facing the entrance of the steel strip insertion slot 11. The inclined surface of the guide slope 72 gradually narrows from the entrance of the concave frame 73 to the inner side. When the steel strip is fed in, it automatically slides into the inner side of the concave frame 73 along the inclined surface to achieve automatic centering, so that the center line of the steel strip is automatically aligned with the center groove 32.

[0036] The pressure plate 74 is fixed to the output end of the pressure cylinder 75, which is installed on the top inner side of the concave frame 73. The pressure plate 74 is positioned opposite to the bottom inner side of the concave frame 73. One side of the pressure plate 74 abuts against the side edge of the guide slope 72, and the two are perpendicular to each other. When the pressure cylinder 75 drives the pressure plate 74 to move downward, it presses the end of the steel strip between the pressure plate 74 and the bottom inner side of the concave frame 73, so that the steel strip and the concave frame 73 form a rigid connection. After clamping, the steel strip moves synchronously with the movement of the concave frame 73, ensuring that the steel strip will not shift during the seam adjustment process.

[0037] A T-shaped plate 731 is fixed to the back side of the symmetrically arranged concave frame 73. The T-shaped plate 731 is a T-shaped connecting plate used to connect the concave frame 73 and the bidirectional adjusting screw 851. The T-shaped plate 731 is provided with a threaded hole, which is threadedly engaged with the bidirectional adjusting screw 851.

[0038] like Figures 6 to 8 As shown, the adaptive seam guiding mechanism 8 includes a fixed crossbeam 81, an adaptive rotating frame 82, a transmission side frame 83, a gear transmission mechanism 84, and a seam adjustment mechanism 85. The top of the welding machine frame 1 is provided with a welding port 12, which is a rectangular opening located directly above the copper pad 3. It is used for the movement of the welding head 2 and welding operations. The fixed crossbeam 81 is suspended and fixed inside the welding port 12. The fixed crossbeam 81 is a high-strength crossbeam, which is set along the length of the copper pad 3 and fixed at both ends to the welding machine frame 1 to provide installation support for the adaptive rotating frame 82 and the transmission side frame 83.

[0039] The transmission side frame 83 includes a main side frame 831 and an auxiliary frame 832. The top ends of the two are respectively connected to the two ends of the fixed crossbeam 81. Both the main side frame 831 and the auxiliary frame 832 are vertically arranged plate-shaped structures, and each has an adjustment groove 833 on its inner side. The adjustment groove 833 is a vertically oriented elongated groove. The lifting slider 834 is fitted inside the adjustment groove 833. The lifting slider 834 can slide up and down along the adjustment groove 833. The top of the lifting slider 834 is connected to the top of the adjustment groove 833 by a spring. The spring provides a downward elastic force, so that the lifting slider 834 always has a downward tendency, thereby ensuring that the roller 823 always presses the surface of the steel strip.

[0040] The auxiliary frame 832 has two limiting holes 8321 on its outer side, corresponding to the upper and lower parts of the adjusting groove 833 respectively. The limiting holes 8321 are circular through holes, and limiting pins 8322 are fitted into the limiting holes 8321. The limiting pins 8322 are cylindrical pins. The lifting slider 834 has a positioning insertion hole 8341 on its back side. The positioning insertion hole 8341 is a circular blind hole. When the lifting slider 834 moves to the upper part of the adjusting groove 833, the limiting pins 8322 are inserted into the upper limiting holes 8321 and positioning insertion holes 8341 to lock the lifting slider 834 in the raised position, so that the roller 823 leaves the steel strip surface for the zeroing stage. When the lifting slider 834 moves to the lower part of the adjusting groove 833, the limiting pins 8322 are inserted into the lower limiting holes 8321 and positioning insertion holes 8341 to lock the lifting slider 834 in the working position. The inner side of the auxiliary frame 832 is provided with a hollow frame 8323, which is a rectangular hollow frame used for the vertical sliding guide of the double-sided toothed plate 841.

[0041] The adaptive rotating frame 82 includes a rotating main shaft 821, a hanger 822, and a roller 823. The adaptive rotating frame 82 has lifting sliders 834 embedded at both ends and rotates in coordination. The rotating main shaft 821 is a horizontally set cylindrical shaft, and its two ends are mounted on the lifting sliders 834 through bearings, allowing it to rotate freely. The hanger 822 is fixedly connected to the middle of the rotating main shaft 821. The hanger 822 has a rectangular structure and swings with the rotation of the rotating main shaft 821. The roller 823 is nested in the lower end of the hanger 822 and rotates in coordination. The roller 823 is a cylindrical roller, and its bottom end abuts against the top surface of the copper pad 3. When the steel strip is below the roller 823, the thickness of the steel strip lifts the roller 823 upward. The roller 823 drives the rotating main shaft 821 to rotate through the hanger 822. The rotation angle of the rotating main shaft 821 corresponds to the thickness of the steel strip.

[0042] like Figure 9 As shown, the gear transmission mechanism 84 includes a double-sided gear plate 841, a main shaft gear 842, a secondary shaft gear 843, a secondary shaft 844, a main bevel gear 845, and a secondary bevel gear 846. The double-sided gear plate 841 is a vertically arranged elongated plate with toothed surfaces on both sides. The double-sided gear plate 841 is fitted into a hollow frame 8323 and slides vertically. The hollow frame 8323 provides a vertical sliding guide for the double-sided gear plate 841, ensuring that the double-sided gear plate 841 can only move in the vertical direction and will not deflect.

[0043] The main shaft gear 842 is fixed at one end of the rotating main shaft 821 and rotates synchronously with the rotating main shaft 821. The secondary shaft gear 843 is installed at one end of the secondary shaft 844 and rotates synchronously with the secondary shaft 844. The main shaft gear 842 and the secondary shaft gear 843 are located on both sides of the double-sided gear plate 841 and are both meshed with the tooth surface of the double-sided gear plate 841. When the rotating main shaft 821 drives the main shaft gear 842 to rotate, the main shaft gear 842 drives the double-sided gear plate 841 to slide up and down along the hollow frame 8323. At the same time, the double-sided gear plate 841 drives the secondary shaft gear 843 to rotate in the opposite direction. The secondary shaft gear 843 drives the main bevel gear 845 to rotate through the secondary shaft 844.

[0044] The main bevel gear 845 is mounted on one end of the secondary shaft 844, which is fixed to the copper pad 3 by bearings. The secondary shaft 844 is a horizontally arranged shaft, parallel to the rotating main shaft 821. The secondary bevel gear 846 is fixed on the bidirectional adjusting screw 851. The main bevel gear 845 and the secondary bevel gear 846 are engaged in transmission. The axis of the main bevel gear 845 is perpendicular to the axis of the secondary bevel gear 846. When the main bevel gear 845 rotates, it drives the secondary bevel gear 846 to rotate. The secondary bevel gear 846 drives the bidirectional adjusting screw 851 to rotate, thereby transmitting the rotation of the adaptive rotating frame 82 to the gap adjustment mechanism 85.

[0045] like Figure 10 and Figure 11 As shown, the weld seam adjustment mechanism 85 includes a bidirectional adjusting screw 851, a torque limiter 852, and a zero-finding drive handwheel 853. The bidirectional adjusting screw 851 is horizontally arranged along the length of the copper pad 3, with both ends passing through the T-shaped plates 731 and threaded together. The two ends of the bidirectional adjusting screw 851 are respectively provided with left-hand threads and right-hand threads. The T-shaped plates 731 on both sides are respectively engaged with the left-hand threads and right-hand threads. When the bidirectional adjusting screw 851 rotates in the forward direction, the T-shaped plates 731 on both sides move synchronously relative to each other, driving the concave frames 73 and the slide 71 on both sides to move synchronously relative to each other, thus reducing the weld seam gap. When the bidirectional adjusting screw 851 rotates in the reverse direction, the T-shaped plates 731 on both sides move synchronously in opposite directions, thus increasing the weld seam gap. Since the T-shaped plates 731 on both sides move synchronously and equidistantly, the weld seam center is always kept at the center position of the copper pad 3, and the weld seam is automatically and accurately aligned with the center groove 32.

[0046] One end of the bidirectional adjusting screw 851 is fixed with a torque limiter 852, and the other end of the torque limiter 852 is connected to the zero-finding drive handwheel 853. The torque limiter 852 includes a symmetrically arranged active friction disc 8521 and a driven friction disc 8522. The driven friction disc 8522 is fixed to the end of the bidirectional adjusting screw 851 and rotates synchronously with the bidirectional adjusting screw 851. A slide rod 8531 is provided through the center of the active friction disc 8521. The slide rod 8531 is a cylindrical rod. The active friction disc 8521 and the slide rod 8531 are connected by a spline or a flat key, so that the active friction disc 8521 can rotate with the slide rod 8531 and slide along the axial direction of the slide rod 8531.

[0047] A pressure-boosting spring 8532 is nested on the outside of the slide rod 8531. The pressure-boosting spring 8532 is a compression spring. One end of the pressure-boosting spring 8532 is connected to the back of the active friction disc 8521, and the other end abuts against the washer 8533. The washer 8533 is an annular washer that is fitted onto the slide rod 8531. An adjusting nut 8534 is provided on one side of the washer 8533. The adjusting nut 8534 is threadedly engaged with the slide rod 8531. By rotating the adjusting nut 8534, the position of the washer 8533 can be adjusted, thereby adjusting the preload of the pressure-boosting spring 8532, and thus adjusting the friction between the active friction disc 8521 and the driven friction disc 8522, that is, adjusting the slippage torque of the torque limiter 852 to adapt to the zeroing requirements of steel strips of different specifications.

[0048] The zero-finding drive handwheel 853 is connected to the end of the slide rod 8531 and is located outside the welding machine frame 1. The zero-finding drive handwheel 853 is a circular handwheel. The operator can rotate the handwheel outside the welding machine frame 1, which drives the active friction disc 8521 to rotate through the slide rod 8531. When the rotational resistance of the bidirectional adjusting screw 851 is less than the set torque of the torque limiter 852, the active friction disc 8521 drives the driven friction disc 8522 to rotate through friction, thereby driving the bidirectional adjusting screw 851 to rotate. When the end faces of the two steel strips come into contact, and the rotational resistance of the bidirectional adjusting screw 851 is greater than the set torque, relative sliding occurs between the active friction disc 8521 and the driven friction disc 8522, the zero-finding drive handwheel 853 spins freely, and the bidirectional adjusting screw 851 stops rotating, thus realizing the automatic establishment of the zero-position reference.

[0049] like Figure 3As shown, the welding head 2 includes a moving drive motor 21, a transverse lead screw 22, a transverse guide rail 23, a head frame 24, and a welding torch 25. The moving drive motor 21 is mounted on the top of the welding machine frame 1. The moving drive motor 21 is a servo motor, which can precisely control the rotation angle and speed. The transverse lead screw 22 is connected to the output end of the moving drive motor 21. The transverse lead screw 22 is set horizontally along the length direction of the copper pad 3. The transverse lead screw 22 passes through the head frame 24 and is screwed together. The transverse guide rail 23 is located inside the welding joint 12. The transverse guide rail 23 is set parallel to the transverse lead screw 22. The transverse guide rail 23 is fitted into one side of the head frame 24 and is slidably engaged. When the moving drive motor 21 drives the transverse lead screw 22 to rotate, the head frame 24 moves linearly along the transverse guide rail 23, thereby moving the welding torch 25 to directly above the weld.

[0050] The welding torch 25 is fixedly installed at the bottom of the headstock 24, with the bottom of the welding torch 25 facing the center groove 32. The welding torch 25 is a tungsten inert gas (TIG) welding torch, which is equipped with a tungsten electrode and an argon nozzle inside. The argon gas supply cylinder 4 is connected to the welding torch 25 through a gas delivery hose to provide argon gas protection for the welding area and prevent the weld metal from oxidizing. The output end of the welding power supply 6 is electrically connected to the welding torch 25 and the copper pad 3. During welding, an electric arc is generated between the tungsten electrode of the welding torch 25 and the steel strip on the copper pad 3. The heat of the electric arc melts the end of the steel strip and the filler metal to form a weld.

[0051] A method for argon arc welding of steel structures, comprising the following steps: Step 1: Steel strip feeding and centering guidance. The steel strip feeding and centering guidance involves feeding two steel strips of the same thickness into the steel strip insertion slot 11 at the top of the welding machine frame 1. The ends of the steel strips slide into the inner side of the concave frame 73 along the inclined surface of the guide slope 72. The inclined surface of the guide slope 72 gradually narrows from the entrance of the concave frame 73 inward. When the steel strips are fed in, they are automatically centered under the guidance of the inclined surface, so that the center line of the steel strip is aligned with the center groove 32 of the copper pad plate 3. The two steel strips are fed in from both sides respectively, with their ends facing each other above the center groove 32.

[0052] Step 2: Steel strip clamping and locking with roller lifting. When the steel strip is clamped and locked with roller lifting, the pressing cylinder 75 is activated, driving the pressure plate 74 to move downward, pressing the end of the steel strip between the pressure plate 74 and the inner bottom of the concave frame 73, so that the steel strip and the concave frame 73 form a rigid connection. After clamping, the steel strip moves synchronously with the movement of the concave frame 73, ensuring that the steel strip will not shift during the seam adjustment process. At the same time, the lifting slider 834 is pushed upward to the upper part of the adjusting groove 833, and the limiting pin 8322 is inserted into the limiting hole 8321 on the upper part of the auxiliary frame 832 and the positioning insertion hole 8341 on the back side of the lifting slider 834, locking the lifting slider 834 in the lifted position, so that the roller 823 leaves the surface of the steel strip, avoiding the roller 823 contacting the steel strip during the zeroing process, which would cause the adaptive rotating frame 82 to rotate prematurely and interfere with the zeroing operation.

[0053] Step 3, Step 1 – Zeroing and Establishing the Zero Reference: Zeroing and establishing the zero reference involves rotating the zeroing drive handwheel 853 on the outside of the welding machine frame 1. The zeroing drive handwheel 853 drives the active friction disc 8521 to rotate via the slide rod 8531. At this time, the rotational resistance of the bidirectional adjusting screw 851 is less than the set torque of the torque limiter 852. The active friction disc 8521 drives the driven friction disc 8522 to rotate through friction. The driven friction disc 8522 drives the bidirectional adjusting screw 851 to rotate in the forward direction. The bidirectional adjusting screw 851 drives the T-shaped plates 731 on both sides to move synchronously relative to each other. 731 drives the concave frame 73 and the slide 71 to move synchronously relative to each other along the T-shaped slide groove 31. The end faces of the two steel strips gradually approach each other. When the end faces of the two steel strips contact each other, the rotation resistance of the bidirectional adjusting screw 851 increases sharply. When the resistance exceeds the set torque of the torque limiter 852, relative sliding occurs between the active friction disc 8521 and the driven friction disc 8522. The zero-finding drive handwheel 853 rotates freely, and the bidirectional adjusting screw 851 stops rotating. At this time, the gap is zero, the zero-position reference is established, and the operator does not need to judge the contact time. The torque limiter 852 automatically slips and stops, and the zero-position reference is established accurately and reliably.

[0054] Step 4, the second step – thickness-driven precise slit opening: After establishing the zero-position reference, stop rotating the zero-finding drive handwheel 853, pull out the limit pin 8322, and the lifting slider 834 moves downward along the adjusting groove 833 under the action of the spring at the top of the adjusting groove 833. The adaptive rotating frame 82 moves downward with the lifting slider 834, and the bottom end of the roller 823 abuts against the surface of the steel strip. The thickness of the steel strip lifts the roller 823 upward. The roller 823 drives the rotating main shaft 821 to rotate through the hanger 822. The rotating main shaft 821 drives the main shaft gear 842 to rotate. The main shaft gear 842 drives the double-sided toothed plate 841 to slide upward along the hollow frame 8323. At the same time, the double-sided toothed plate 841 drives the secondary shaft gear 843 to rotate in the opposite direction. The secondary shaft gear 843 drives the main bevel gear 845 to rotate through the secondary shaft 844. The main bevel gear 845 drives the secondary bevel gear 845 to rotate. 6. Rotation, the secondary bevel gear 846 drives the bidirectional adjusting screw 851 to rotate in the opposite direction. The bidirectional adjusting screw 851 drives the two T-shaped plates 731 to move synchronously in opposite directions. The T-shaped plates 731 drive the concave frame 73 and the slide 71 to move synchronously in opposite directions along the T-shaped slide groove 31. The gap between the weld seams gradually opens from the zero position. The double-sided toothed plate 841 stops after moving to the position determined by the thickness of the steel strip. The gap between the weld seams is precisely opened to the target value that matches the thickness of the steel strip. The thicker the steel strip, the greater the lifting amount of the roller 823, the greater the rotation angle of the rotating main shaft 821, the greater the movement amount of the double-sided toothed plate 841, and the greater the reverse rotation angle of the bidirectional adjusting screw 851. The gap between the weld seams is larger, which perfectly matches the welding process requirements of steel strips of different thicknesses. Since the two concave frames 73 move synchronously and equidistantly, the center of the weld seam is always kept at the center position of the copper pad plate 3, and the weld seam is automatically and accurately aligned with the center groove 32.

[0055] Step 5: Welding head positioning and welding. The welding head positioning and welding are performed by starting the moving drive motor 21, which drives the transverse lead screw 22 to rotate. The transverse lead screw 22 drives the head frame 24 to move along the transverse guide rail 23. The head frame 24 moves the welding torch 25 to directly above the weld seam, with the bottom of the welding torch 25 facing the center groove 32. The valve of the argon gas supply cylinder 4 is opened, and argon gas is delivered to the welding torch 25 through the gas delivery hose and sprayed out from the nozzle of the welding torch 25, forming an argon protective atmosphere in the welding area. The welding power supply 6 is started, and an electric arc is generated between the tungsten electrode of the welding torch 25 and the steel strip on the copper pad 3. The heat of the electric arc melts the end of the steel strip to form a molten pool. As the welding head 2 moves along the weld seam direction, the molten pool cools and solidifies to form the weld seam. The center groove 32 ensures that the back of the weld seam is well formed and the penetration is uniform.

[0056] Step 6: Loosening and unloading the material. After welding is completed, the valves of the welding power supply 6 and the argon gas supply cylinder 4 are turned off, the welding arc is extinguished, the argon gas supply stops, the lower cylinder 75 is reset, the pressure plate 74 is released upwards to loosen the steel strip, and the welded steel strip is taken out from the steel strip slot 11. This completes the argon arc welding process of the steel strip, and the equipment is ready for the next welding.

[0057] The working principle of the above embodiments is as follows: Before using the equipment, the slippage torque of the torque limiter 852 needs to be adjusted according to the steel strip specifications. The preload of the booster spring 8532 is adjusted by rotating the adjusting nut 8534, thereby adjusting the friction between the active friction disc 8521 and the driven friction disc 8522. The slippage torque should be slightly greater than the screw resistance when the steel strip end face contacts, to ensure that the end face contacts can slip in time, while not slipping prematurely during normal adjustment.

[0058] During welding in a strong electromagnetic environment, two steel strips are fed into the steel strip slot 11. The ends of the steel strips automatically slide into the inner side of the concave frame 73 along the inclined surface of the guide slope 72, achieving automatic centering and aligning the center line of the steel strip with the center groove 32. The pressing cylinder 75 drives the pressure plate 74 to press and fix the steel strip, forming a rigid connection between the steel strip and the concave frame 73. At the same time, the lifting slider 834 is pushed upward to the upper part of the adjusting groove 833 and locked with the limit pin 8322, causing the roller 823 to leave the surface of the steel strip and avoiding interference from the roller 823 during the zeroing stage.

[0059] Rotating the zero-finding drive handwheel 853 drives the bidirectional adjusting screw 851 to rotate forward via the torque limiter 852. The two concave frames 73 move synchronously relative to each other, and the end faces of the two steel strips gradually approach each other. After the end faces contact, the resistance of the screw increases sharply, the torque limiter 852 automatically slips, the handwheel spins freely, the screw stops, and the zero-position reference is established.

[0060] Pulling out the limit pin 8322 causes the lifting slider 834 to fall under the action of the spring, and the roller 823 abuts against the surface of the steel strip. The thickness of the steel strip lifts the roller 823, which drives the rotating main shaft 821 to rotate via the hanger 822. The main shaft gear 842 drives the double-sided gear plate 841 to move upward, and the double-sided gear plate 841 drives the secondary shaft gear 843 to rotate in the opposite direction. The secondary shaft 844 drives the main bevel gear 845 to rotate, and the main bevel gear 845 drives the secondary bevel gear 846 to rotate. The secondary bevel gear 846 drives the bidirectional adjusting screw 851 to rotate in the opposite direction. The two concave frames 73 move synchronously in opposite directions, and the seam gap is precisely opened from zero to the target value that matches the thickness of the steel strip. The thicker the steel strip, the greater the amount of roller lifting, the greater the screw reversal angle, and the larger the seam gap.

[0061] After the seam is aligned, welding head 2 moves to the weld position, argon gas is supplied, the welding power supply is started, and argon arc welding is performed. The center groove 32 ensures good weld formation on the back side. After welding, the pressure plate is released, and the steel strip is removed.

[0062] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A steel structure argon arc welding equipment, comprising a welding machine frame (1) and a welding head (2) disposed on the welding machine frame (1), and further comprising a copper pad (3), wherein the copper pad (3) is fixedly installed on the upper part of the welding machine frame (1), and the welding head (2) is disposed above the copper pad (3), characterized in that, A centering guide fixing mechanism (7) is provided above the copper pad (3), and an adaptive seam guide mechanism (8) is provided on one side of the centering guide fixing mechanism (7). The upper part of the welding frame (1) is provided with a steel strip insertion slot (11), and the copper pad (3) is provided on the bottom surface inside the steel strip insertion slot (11). The copper pad (3) is symmetrically provided with two sets of T-shaped grooves (31), and the T-shaped grooves (31) are fitted with a centering guide fixing mechanism (7). The centering guide fixing mechanism (7) includes a slide (71), a guide ramp (72), a concave frame (73), a pressure plate (74), and a pressing cylinder (75). The concave frame (73) is fixed to one side of the slide (71) by an L-shaped fixing plate. The guide ramp (72) is welded to the inside of the concave frame (73). The pressure plate (74) is fixed to the output end of the pressing cylinder (75). The pressing cylinder (75) is installed at the top inside of the concave frame (73). The pressure plate (74) is arranged opposite to the bottom inside of the concave frame (73). The adaptive seam guiding mechanism (8) includes a fixed crossbeam (81), an adaptive rotating frame (82), a transmission side frame (83), a gear transmission mechanism (84), and a seam adjustment mechanism (85). The transmission side frame (83) is vertically fixed to the bottom of both ends of the fixed crossbeam (81). The two ends of the adaptive rotating frame (82) slide against the inner side of the transmission side frame (83). One end of the adaptive rotating frame (82) is engaged with the gear transmission mechanism (84), and the gear transmission mechanism (84) engages with the seam adjustment mechanism (85).

2. The steel structure argon arc welding equipment according to claim 1, characterized in that, The copper pad (3) has a central groove (32) along its length. The slides (71) arranged along the length of the copper pad (3) are fitted with a coordinating rod (311). The bottom of the slides (71) is fitted with a T-shaped slide groove (31) and slides. The guide slope (72) is a right-angled prism structure, with the inclined surface facing the entrance of the steel strip slot (11). One side of the pressure plate (74) abuts against the side edge of the guide slope (72), and the pressure plate (74) and the guide slope (72) are arranged perpendicular to each other.

3. The steel structure argon arc welding equipment according to claim 2, characterized in that, The welding machine frame (1) has a welding port (12) at the top. The fixed crossbeam (81) is suspended and fixed inside the welding port (12). The transmission side frame (83) includes a main side frame (831) and an auxiliary frame (832). The top ends of the main side frame (831) and the auxiliary frame (832) are respectively connected to the two ends of the fixed crossbeam (81). The main side frame (831) and the auxiliary frame (832) are both provided with adjustment grooves (833) inside. The lifting slider (834) is fitted inside the adjustment groove (833). The top of the lifting slider (834) is connected to the top of the adjustment groove (833) by a spring.

4. The steel structure argon arc welding equipment according to claim 3, characterized in that, The adaptive rotating frame (82) includes a rotating main shaft (821), a hanger (822) and a roller (823). The adaptive rotating frame (82) has lifting sliders (834) fitted at both ends and rotates in cooperation. The hanger (822) is fixedly connected to the middle of the rotating main shaft (821). The roller (823) is nested in the lower end of the hanger (822) and rotates in cooperation. The bottom end of the roller (823) abuts against the top surface of the copper pad (3).

5. The steel structure argon arc welding equipment according to claim 4, characterized in that, The auxiliary frame (832) has two limiting holes (8321) on its outer side, and the two limiting holes (8321) correspond to the upper and lower parts of the adjustment groove (833) respectively. The limiting holes (8321) are fitted with limiting pins (8322). The lifting slider (834) has a positioning insertion hole (8341) on its back side. The auxiliary frame (832) has a hollow frame (8323) on its inner side.

6. The steel structure argon arc welding equipment according to claim 5, characterized in that, The gear transmission mechanism (84) includes a double-sided gear plate (841), a main shaft gear (842), a secondary shaft gear (843), a secondary shaft (844), a main bevel gear (845), and a secondary bevel gear (846). The double-sided gear plate (841) is fitted into the hollow frame (8323) and slides vertically. The main shaft gear (842) is fixed at one end of the rotating main shaft (821), and the secondary shaft gear (843) is installed at one end of the secondary shaft (844). The main shaft gear (842) and the secondary shaft gear (843) are meshed on both sides of the double-sided gear plate (841).

7. The steel structure argon arc welding equipment according to claim 6, characterized in that, The main bevel gear (845) is mounted on one end of the secondary shaft (844), which is fixed on the copper pad (3) by bearings. The secondary bevel gear (846) is fixed on the bidirectional adjusting screw (851). The main bevel gear (845) and the secondary bevel gear (846) are engaged in transmission. One end of the bidirectional adjusting screw (851) is fixedly connected to one side of the torque limiter (852), and the other side of the torque limiter (852) is connected to the zero-finding drive handwheel (853).

8. The steel structure argon arc welding equipment according to claim 7, characterized in that, The seam adjustment mechanism (85) is equipped with a bidirectional adjusting screw (851). A T-shaped plate (731) is fixed to the back of the symmetrically arranged concave frame (73). Both ends of the bidirectional adjusting screw (851) pass through the T-shaped plate (731) and are threaded together. The torque limiter (852) includes a symmetrically arranged active friction disc (8521) and a driven friction disc (8522). The driven friction disc (8522) is fixed to the end of the bidirectional adjusting screw (851). The center of the active friction disc (8521) is... A sliding rod (8531) is provided through the slide rod (8531), and a pressure spring (8532) is nested on the outside of the slide rod (8531). One end of the pressure spring (8532) is connected to the back of the active friction disc (8521), and the other end abuts against the gasket (8533). An adjusting nut (8534) is provided on one side of the gasket (8533), and the adjusting nut (8534) is threadedly engaged with the slide rod (8531). The zero-finding drive handwheel (853) is connected to the end of the slide rod (8531) and is located outside the welding machine frame (1).

9. A steel structure argon arc welding equipment according to claim 8, characterized in that, The welding head (2) includes a moving drive motor (21), a transverse lead screw (22), a transverse guide rail (23), a head frame (24), and a welding torch (25). The moving drive motor (21) is mounted on the top of the welding machine frame (1). The transverse lead screw (22) is connected to the output end of the moving drive motor (21). The transverse lead screw (22) passes through the head frame (24) and is screwed together. The transverse guide rail (23) is located inside the welding joint (12). The head frame (24) is embedded on one side. The welding torch (25) is connected to the horizontal guide rail (23) and slides in fit. The bottom end of the welding torch (25) is directly opposite the center groove (32). The welding torch (25) is connected to the argon gas supply cylinder (4) through the gas supply hose. The welding machine frame (1) is provided with a control panel (5) on one side. The welding power supply (6) is provided at the bottom of the welding machine frame (1). The control panel (5) is electrically connected to the welding power supply (6) and the moving drive motor (21). The output end of the welding power supply (6) is electrically connected to the welding torch (25) and the copper pad (3).

10. A welding method for the steel structure argon arc welding equipment as described in claim 9, characterized in that, Includes the following steps: Step 1: Steel strip feeding and centering guidance. The steel strip feeding and centering guidance involves feeding two steel strips of the same thickness into the steel strip slot (11) at the top of the welding machine frame (1). The ends of the steel strips slide into the inner side of the concave frame (73) along the inclined surface of the guide slope (72). The guide slope (72) guides and centers the steel strips from both sides, so that the center line of the steel strip is aligned with the center groove (32) of the copper pad plate (3). Step 2: Steel strip clamping and fixing and roller lifting and locking. The steel strip clamping and fixing and roller lifting and locking are achieved by the action of the pressing cylinder (75), which drives the pressure plate (74) to move downward, pressing the end of the steel strip between the pressure plate (74) and the bottom of the inner side of the concave frame (73), so that the steel strip and the concave frame (73) form a rigid connection. After clamping, the steel strip moves synchronously with the movement of the concave frame (73), and at the same time, the lifting slider (834) is pushed upward to the upper part of the adjustment groove (833). The limiting pin (8322) is inserted into the limiting hole (8321) on the upper part of the auxiliary frame (832) and the positioning insertion hole (8341) on the back side of the lifting slider (834), locking the lifting slider (834) in the lifted position, so that the roller (823) leaves the surface of the steel strip. Step 3: Establish zero-position reference by contacting the zero-position reference. Rotate the zero-position drive handwheel (853) on the outside of the welding machine frame (1). The zero-position drive handwheel (853) drives the active friction disc (8521) to rotate through the slide rod (8531). The active friction disc (8521) drives the driven friction disc (8522) to rotate through friction. The driven friction disc (8522) drives the bidirectional adjusting screw (851) to rotate in the forward direction. The bidirectional adjusting screw (851) drives the T-plates (731) on both sides to move synchronously relative to each other. The concave frame (73) and the slide (71) move synchronously relative to each other along the T-shaped slide groove (31). The end faces of the two steel strips gradually approach each other. When the end faces of the two steel strips contact each other, the rotation resistance of the bidirectional adjusting screw (851) increases sharply. When the resistance exceeds the set torque of the torque limiter (852), relative sliding occurs between the active friction disc (8521) and the driven friction disc (8522). The zero-finding drive handwheel (853) rotates freely, and the bidirectional adjusting screw (851) stops rotating. At this time, the gap between the seams is zero, and the zero position reference is established. Step 4: Thickness-driven precise slit opening. Stop rotating the zero-finding drive handwheel (853), pull out the limit pin (8322), and the lifting slider (834) moves downward along the adjusting groove (833) under the action of the spring at the top of the adjusting groove (833). The adaptive rotating frame (82) moves downward with the lifting slider (834). The bottom end of the roller (823) abuts against the surface of the steel strip. The thickness of the steel strip lifts the roller (823) upward. The roller (823) drives the rotating main shaft (821) to rotate through the hanger (822). The rotating main shaft (821) drives the main shaft gear (842) to rotate. The main shaft gear (842) drives the double-sided toothed plate (841) to slide up and down along the hollow frame (8323). The double-sided toothed plate (841) drives the secondary shaft gear (843) to rotate in the opposite direction. The secondary shaft gear (843) drives the secondary shaft (844) to rotate. The main bevel gear (845) rotates, driving the secondary bevel gear (846) to rotate. The secondary bevel gear (846) drives the bidirectional adjusting screw (851) to rotate in the opposite direction. The bidirectional adjusting screw (851) drives the two T-shaped plates (731) to move synchronously in opposite directions. The T-shaped plates (731) drive the concave frame (73) and the slide (71) to move synchronously in opposite directions along the T-shaped slide groove (31). The gap between the two sides gradually opens from the zero position. The double-sided toothed plate (841) stops after moving to the position determined by the thickness of the steel strip. The gap between the two sides is precisely opened to the target value that matches the thickness of the steel strip. The thicker the steel strip, the greater the lifting amount of the roller (823), the greater the rotation angle of the rotating main shaft (821), the greater the movement amount of the double-sided toothed plate (841), the greater the reverse rotation angle of the bidirectional adjusting screw (851), and the larger the gap between the two sides. Step 5: Welding head positioning and welding. The welding head positioning and welding is performed by starting the moving drive motor (21), driving the transverse lead screw (22) to rotate, the transverse lead screw (22) driving the head frame (24) to move along the transverse guide rail (23), the head frame (24) driving the welding torch (25) to move directly above the weld seam, the bottom end of the welding torch (25) is directly facing the center groove (32), the valve of the argon gas supply cylinder (4) is opened, the argon gas is delivered to the welding torch (25) through the gas delivery hose, the welding power supply (6) is started, an electric arc is generated between the welding torch (25) and the copper pad (3), and argon arc welding is performed on the joint of the steel strip. Step 6, loosening and unloading the material: After welding is completed, the welding power supply (6) and the valve of the argon gas supply cylinder (4) are turned off, the cylinder (75) is reset, the pressure plate (74) is released upwards to loosen the steel strip, and the welded steel strip is taken out from the steel strip slot (11). This completes the argon arc welding process of the steel strip.

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