Back-gouging-free welding process for T-shaped fillet weld

Abstract

The invention relates to the technical field of welding, in particular to a T-shaped fillet weld back-gouging-free welding process which comprises the steps that S1, pretreatment and blanking of steel are completed, and symmetrical double grooves are formed in the two sides of a web of a T-shaped weld; s2, a to-be-welded area and an adjacent area of the groove are polished and derusted, and the metallic luster of the base metal is exposed; s3, a T-shaped fillet welding seam is formed, a weldment is subjected to positioned welding, and it is guaranteed that the welding seam is located at the transverse fillet welding position; s4, two welding guns are used on the two sides of the welding seam, backing welding is completed through gas shield welding, and the two welding guns are arranged in front and behind; and S5, two welding guns are used on the two sides of the welding seam correspondingly, and multi-layer and multi-pass filling and cosmetic welding are completed through gas shielded welding. Therefore, through the process steps, gas shield welding double-face back-gouging-free welding can be achieved for the T-shaped fillet weld, the welding process can adapt to a larger range of gap change tolerance by adjusting welding parameters, and the back-gouging-free process can be effectively popularized.

Description

Technical Field

[0001] The present application relates to the field of welding technology, and in particular to a T-type fillet weld root cleaning-free welding process. Background Art

[0002] The existing T-type full penetration fillet weld root cleaning-free process has very strict assembly requirements, that is, it can only adapt to a small range of root gap changes of 0 to 1 mm at most, and the weld quality is difficult to guarantee. Therefore, the process application range is very narrow, and most of it can only be used for welding regular H-shaped steel and other workpieces. The root cleaning-free process cannot be effectively promoted. Summary of the invention

[0003] The purpose of the present application is to provide a T-type fillet weld root cleaning-free welding process, which to a certain extent solves the technical problems in the prior art that the T-type full penetration fillet weld root cleaning-free process has strict assembly requirements, that is, it can only adapt to a small range of root gap changes of 0 to 1 mm, the weld quality is difficult to guarantee, the process requirements are harsh, and the adaptability to workpiece types is poor.

[0004] The present application provides a T-type fillet weld root cleaning-free welding process, comprising the following steps:

[0005] S1. Complete the pretreatment and cutting of steel materials, and open symmetrical double-sided grooves on both sides of the web of the T-shaped weld;

[0006] S2. Grind the welding area and adjacent areas of the groove to remove impurities that affect the welding quality and expose the metallic luster of the parent material;

[0007] S3. Complete the assembly between the web and the bottom plate to form a T-shaped fillet weld, and perform positioning welding on the weldment to ensure that the weld is located at the horizontal fillet welding position;

[0008] S4. Two welding guns are used on both sides of the weld to complete the base welding by gas shielded welding, and the welding starting point and welding end point of the two welding guns are the same. In the base welding process, the two welding guns are arranged one in front and one in the back, where the welding gun close to the welding end point is the front welding gun, and the welding gun close to the welding starting point is the back welding gun, and the arc in the form of jet transition is used in the base welding process;

[0009] S5. Two welding guns are used on both sides of the weld respectively, and gas shielded welding is used to complete multi-layer and multi-pass filling and capping welding, and pulse droplet transition arc is used in the filling and capping welding processes.

[0010] In the above technical solution, further, when the web plate and the bottom plate are assembled, a K-shaped groove with a blunt edge is formed between the two.

[0011] In any of the above technical solutions, further, in step S1, the grooves on both sides are processed by flame cutting, and the angle of the single-sided groove is 45-50°, and the thickness of the blunt edge of the K-shaped groove is 0-2 mm.

[0012] In any of the above technical solutions, further, in step S1, the thickness of the web is 12 to 60 mm.

[0013] In any of the above technical solutions, further, in step S2, the grinding area includes the groove and an area with a distance of 20 to 30 mm therefrom.

[0014] In any of the above technical solutions, further, in step S3, the positioning weld is ground before welding to remove welding defects, and the end is ground to form a transition slope, and the gap between the root of the web and the bottom plate is ensured to be 0 to 3 mm.

[0015] In any of the above technical solutions, further, in step S4 and step S5, the front welding gun achieves uniform penetration and back forming of the root of the groove, and the rear welding gun performs remelting welding on the back root of the previous weld.

[0016] In any of the above technical solutions, further, in step S4, the front welding gun adopts a non-swinging method during the base welding process, and the end of the welding wire of the front welding gun points to the center line of the weld and deviates 1 to 2 mm outward, the welding current is 320-330A, the welding voltage is 32-35V, the welding speed is 320-330mm / min, and the angle of the front welding gun is 30-35°.

[0017] In any of the above technical solutions, further, in step S4, the rear welding gun adopts a swinging or non-swinging mode during the base welding process, and the end of the welding wire of the rear welding gun points to the center line of the weld; when the rear welding gun is not swinging welding, the welding current is 300-310A, the welding voltage is 29-30V, the welding speed is 320-330mm / min, and the angle of the welding gun is 25-30°; when the rear welding gun is swinging welding, the welding current is 260-280A, the welding voltage is 28-30V, the welding speed is 320-330mm / min, and the angle of the rear welding gun is 25-30°.

[0018] In any of the above technical solutions, further, in step S5, during the filling and capping welding process, according to the plate thickness and the form of the groove, the two welding guns perform multi-layer and multi-pass welding in a swinging or non-swinging form, and the welding parameters of the two welding guns are as follows: welding current is 240-280A, welding voltage is 26-30V, welding speed is 320-340mm / min, and the angle of the welding gun is 30-50°.

[0019] In any of the above technical solutions, further, the welding shielding gas is 80% Ar+20% CO2, and the welding material is a solid welding wire with a diameter of 1.2 mm that matches the material of the parent material.

[0020] In any of the above technical solutions, further, in step S4 and step S5, an industrial robot is used for welding, and welding parameters are set before welding.

[0021] In any of the above technical solutions, further, in step S4, the front-to-back distance between the two welding guns is L, and L≥30mm, the two welding guns can weld at the same time or the welding operation of the rear welding gun can be carried out after the front welding gun completes the front primer.

[0022] In any of the above technical solutions, further, the following step is included between step S3 and step S4: preheating the base material by flame heating or electromagnetic induction heating.

[0023] Compared with the prior art, the beneficial effects of this application are:

[0024] The T-type fillet weld root cleaning-free welding process provided by the present application adjusts the position and angle of the front and rear welding guns, and adopts gas shielded welding to directly perform double-sided base and double-sided filling and covering. In the base welding process, the arcs of the two welding guns adopt the jet transition form, and the arc is strong and powerful. Therefore, the base can achieve effective penetration. In the filling and covering welding process, the arcs of the two welding guns adopt the pulse droplet transition form, the welding efficiency is high, the spatter is small, the forming is beautiful, and the peak current of the pulse arc can help to effectively melt the interlayer oxide scale, avoiding the interlayer grinding and cleaning work, and the strong arc force can bring out the impurities at the root of the base weld to ensure the quality of the base weld. It can be seen that the method can achieve root cleaning-free full penetration welding, and by adjusting the position and angle of the front and rear welding guns, gas shielded welding is used to directly perform double-sided base and double-sided filling and covering, which can adapt to a larger range of gap variation tolerances, such as 0-3mm, and there is no need to adjust the welding parameters during the welding process, the operation difficulty is reduced, and the root cleaning process can be effectively promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of a groove provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of a polishing area provided in an embodiment of the present application;

[0028] Figure 3 Another schematic diagram of a grinding area provided in an embodiment of the present application;

[0029] Figure 4 A schematic diagram of a welding position provided in an embodiment of the present application;

[0030] Figure 5 A schematic diagram of the distance between two welding guns provided in an embodiment of the present application;

[0031] Figure 6 A schematic diagram of the positions of two welding guns provided in an embodiment of the present application.

[0032] Reference numerals:

[0033] 1-web, 2-bottom plate, 3-single-side groove, 4-grinding area, 5-weld centerline, 6-front welding gun, 7-rear welding gun. DETAILED DESCRIPTION

[0034] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0035] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0036] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0037] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] Refer to the following Figures 1 to 6 A T-type fillet weld root cleaning-free welding process according to some embodiments of the present application is described.

[0040] See also Figures 1 to 6 As shown, an embodiment of the present application provides a T-type fillet weld root cleaning-free welding process, comprising the following steps:

[0041] S1. Complete the pretreatment and cutting of steel materials, and open symmetrical double-sided grooves on both sides of the web 1 of the T-shaped weld;

[0042] S2. Grind the welding area and adjacent areas of the groove to remove impurities that affect welding quality and expose the parent material;

[0043] S3, complete the assembly, positioning welding and grinding between the web 1 and the bottom plate 2, and place the bottom plate 2 horizontally and the web 1 vertically to ensure that the weld is located at the horizontal fillet welding position;

[0044] S4. Two welding guns are used on both sides of the weld respectively, and the base welding is completed by gas shielded welding, and the welding starting point and welding end point of the two welding guns are the same. In the base welding process, the two welding guns are arranged one in front and one in the back, wherein the welding gun close to the welding end point is the front welding gun 6, and the welding gun close to the welding starting point is the rear welding gun 7, and the arc in the form of jet transition is used in the base welding process;

[0045] S5. Two welding guns are used on both sides of the weld, and gas shielded welding is used to complete multi-layer and multi-pass filling and capping welding. In the filling and capping welding processes, pulse droplet transition arc is used.

[0046] According to the above description, the T-type fillet weld root cleaning-free welding process provided by the present application adjusts the position and angle of the front and rear welding guns, and adopts gas shielded welding to directly perform double-sided base and double-sided filling and covering. In the base welding process, the arcs of the two welding guns adopt the jet transition form, and the arc is strong and powerful. Therefore, the base can achieve effective penetration. In the filling and covering welding process, the arcs of the two welding guns adopt the pulse droplet transition form, with high welding efficiency, small spatter, and beautiful forming. The peak current of the pulse arc can help to effectively melt the interlayer oxide scale, avoiding the interlayer grinding and cleaning work, and the strong arc force can bring out the impurities at the root of the base weld to ensure the quality of the base weld. It can be seen that the present method can achieve root cleaning-free full penetration welding, and by adjusting the position and angle of the front and rear welding guns, gas shielded welding is used to directly perform double-sided base and double-sided filling and covering, which can adapt to a wider range of gap variation tolerances, so that the root cleaning process can be effectively promoted.

[0047] In this embodiment, preferably, Figure 1 As shown, in step S1, when the web 1 and the bottom plate 2 are assembled, a K-shaped groove with a blunt edge is formed between the two. For the single-sided groove 3, it is a V-shaped groove. It can be seen that a blunt edge is arranged between the two V-shaped grooves, which can effectively avoid the burn-through of the base weld and has better tolerance adaptability. At the same time, it can also reduce the heat affected zone generated during welding, reduce welding stress and deformation, and improve the strength and toughness of the weld, thereby improving the welding quality.

[0048] Further, preferably, Figure 1 As shown, in step S1, flame cutting is used to form grooves on both sides, and the angle of the single-side groove 3 is θ, and θ is 45-50°, the thickness of the blunt edge of the entire K-shaped groove is a, and 0<a<2mm.

[0049] In this embodiment, preferably, Figure 1 As shown, in step S1, the thickness of the web 1 is t, and 12mm≤t≤60mm, which meets the strength and use requirements, of course, but is not limited to this.

[0050] In this embodiment, preferably, Figures 1 to 3 As shown, in step S2, the grinding area 4 includes the single-sided groove 3 and an area with a distance m therefrom of 20 to 30 mm. It should be noted that the distance range includes two end point values.

[0051] According to the above description, it can be seen that impurities such as rust that affect the welding quality are fully removed, the metallic luster of the base material is exposed, and the quality of the welding area is improved.

[0052] In this embodiment, preferably, Figures 1 to 3As shown, in step S3, the gap between the root of the web 1 and the bottom plate 2 is b, and 0≤b≤3mm. The positioning weld is ground before welding to remove welding defects, and the end is ground to form a transition slope, so that a smooth transition can be achieved during the welding process, thereby ensuring that the front bottom weld can be effectively melted through at the joint position. It can be seen that this process can adapt to the gap variation tolerance of 0 to 3mm, and has a wider practical range.

[0053] In this embodiment, preferably, Figures 1 to 3 As shown, in this embodiment, preferably, the following step is further included between step S3 and step S4: preheating the base material by flame heating or electromagnetic induction heating.

[0054] According to the above description, it can be known that according to the specific plate thickness and material of the parent material, preheating measures should be taken for the weld to be welded. Preheating the parent material before welding can reduce the cooling rate of the weld joint, avoid the formation of hardened structure and reduce welding stress and deformation, thereby preventing the generation of welding cracks. Among them, flame heating is simpler to operate and can adapt to various welding conditions, while electromagnetic induction heating has high heating efficiency and a wide heating area, and can be selected according to actual needs.

[0055] In this embodiment, preferably, Figures 1 to 3 As shown, in step S4 and step S5, an industrial robot is used for welding, and the welding power source is CLOOS-A500FG, which has a "rapid weld" or deep melting welding mode, corresponding to which the welding arc is in a jet transition form, and a "speed weld" or fast pulse welding mode, corresponding to which the welding arc is in a pulse droplet transition form. Of course, it is not limited to this, and can also be selected according to actual needs.

[0056] In this embodiment, preferably, Figures 1 to 3 As shown, in step S4 and step S5, the front welding gun 6 performs uniform penetration and back forming on the root of the single-sided groove 3, and the rear welding gun 7 performs remelting welding on the root of the penetration weld.

[0057] In this embodiment, preferably, Figures 1 to 3 As shown, in step S4, the front welding gun 6 adopts a non-swinging mode during the base welding process, and the welding wire of the front welding gun 6 points to the center line of the weld, that is, the weld center line 5 is 1 to 2 mm outward, the welding current is 320-330A, the welding voltage is 32-35V, the welding speed is 320-330mm / min, and the angle of the front welding gun 6 is 30-35°. It should be noted that the aforementioned data range includes two endpoint values.

[0058] According to the above description, during base welding, the power supply of the front gun uses the "rapid weld" mode, which can adjust a concentrated and stable high-intensity jet arc to achieve stable base melting depth and back penetration.

[0059] In this embodiment, preferably, Figures 1 to 3 As shown, in step S4, the rear welding gun 7 adopts a swinging or non-swinging mode during the bottom welding process, and the rear welding gun 7 points to the weld center line 5; when the rear welding gun 7 is not swinging for welding, the welding current is 300-310A, the welding voltage is 29-30V, the welding speed is 320-330mm / min, and the welding gun angle is 25-30°; when the rear welding gun 7 is swinging for welding, the welding current is 260-280A, the welding voltage is 28-30V, the welding speed is 320-330mm / min, and the angle of the rear welding gun 7 is 25-30°. It should be noted that the aforementioned data range includes two endpoint values.

[0060] According to the above description, during the base welding, the power supply of the rear gun selects the "rapid weld" mode, which can adjust a concentrated and stable high-intensity jet arc, and can remelt the back of the root of the base weld of the front welding gun 6. The strong arc force can bring out the impurities at the root and ensure the quality of the base weld.

[0061] In this embodiment, preferably, Figures 1 to 3 As shown, in step S5, during the filling and capping welding process, according to the plate thickness and the form of the groove, the two welding guns perform multi-layer and multi-pass welding in a swinging or non-swinging form, and the welding parameters of the two welding guns are as follows: welding current is 240-280A, welding voltage is 26-30V, welding speed is 320-340mm / min, and the angle of the welding gun is 30-50°. It should be noted that the aforementioned data range includes two endpoint values.

[0062] According to the above description, pulse arc is used for filling and cap welding, and welding is carried out according to the above welding parameters, which can adjust a concentrated and stable pulse droplet transition arc. The oxide scale breaking effect of pulse peak current and the stable swinging effect of robot welding gun can realize cleaning-free welding between layers, and the welding efficiency is high, spatter is small, and the shape is beautiful.

[0063] In this embodiment, preferably, Figures 1 to 3 As shown, the welding shielding gas adopts 80% Ar + 20% CO2. The above argon-rich shielding gas can reduce the critical conditions of the molten droplet jet transition, ensure the stable and reliable molten droplet transition, and can reduce the oxidation burning during the welding process to ensure the quality of the base weld; the welding material is a solid welding wire with a diameter of 1.2mm that matches the material of the base material, which can take into account the stability of the welding arc and the welding efficiency.

[0064] In this embodiment, preferably, Figures 1 to 3 As shown, in step S4, the distance between the two welding guns is L, and L≥30mm. The two welding guns can weld at the same time or the welding operation of the rear welding gun 7 can be carried out after the front welding gun 6 completes the front primer.

[0065] According to the above description, during the welding process, the two welding guns are staggered by an arc distance, which can effectively avoid arc interference and thus ensure the welding quality.

[0066] Combined with the above, it can be known that the angle between the front welding gun 6 and the horizontal plane is 30-35°, the center of the arc points to the position 1-2mm outside the intersection line of the single-sided groove 3 of the web 1 and the bottom plate 2, and the angle between the rear welding gun 7 and the horizontal plane is 25-30°, and the center of the arc points to the position of the intersection line of the single-sided groove 3 of the web 1 and the bottom plate 2, so that this process can adapt to the gap change tolerance of 0-3mm. Therefore, the heat of the front gun arc is mainly used to melt the base material of the bottom plate 2 to avoid burning through the base weld, thereby increasing the tolerance adaptability. It can be seen that the use of this process can complete the root cleaning-free welding of T-type penetration fillet welds, and at the same time can adapt to the root gap change of 0-3mm without adjusting the process parameters, which can simultaneously improve the weld quality and improve the welding efficiency by 2.5-3 times.

[0067] In summary, the T-type fillet weld root cleaning-free welding process provided by the present application has the following advantages: the T-type fillet weld root cleaning-free welding process provided by the present application adjusts the position and angle of the front and rear welding guns, and uses gas shielded welding to directly perform double-sided priming and double-sided filling and covering. The angle setting of the front and rear welding guns can adapt to the gap variation tolerance of 0-3mm, and cooperate with the blunt edge between the grooves to effectively avoid burning through the base weld.

[0068] The above-mentioned effective effects are specifically illustrated by detailed experiments:

[0069]

[0070]

[0071] It can be seen that the use of this process for T-type penetration fillet welding can improve the welding efficiency by 2.5-3 times.

[0072] In addition, in a set of data, for example, the time comparison between the web 1 and the bottom plate 2 welded by this process and the ordinary manual welding process:

[0073]

[0074] It can be seen that the process of T-type penetration fillet welding using this process takes less time than the ordinary process and can improve the welding efficiency by at least 2.5-3 times.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A T-type fillet weld root cleaning-free welding process, characterized in that: The steps include: S1. Complete the pretreatment and cutting of steel materials, and open symmetrical double-sided grooves on both sides of the web of the T-shaped weld; S2. Grind the welding area and adjacent areas of the groove to remove impurities that affect the welding quality and expose the metallic luster of the parent material; S3. Complete the assembly between the web and the bottom plate to form a T-shaped fillet weld, and perform positioning welding on the weldment to ensure that the weld is located at the horizontal fillet welding position; S4. Two welding guns are used on both sides of the weld to complete the base welding by gas shielded welding, and the welding starting point and welding end point of the two welding guns are the same. In the base welding process, the two welding guns are arranged one in front and one in the back, where the welding gun close to the welding end point is the front welding gun, and the welding gun close to the welding starting point is the back welding gun, and the arc in the form of jet transition is used in the base welding process; S5. Two welding guns are used on both sides of the weld respectively, and gas shielded welding is used to complete multi-layer and multi-pass filling and capping welding, and pulse droplet transition arc is used in the filling and capping welding processes.

2. The T-type fillet weld root cleaning-free welding process according to claim 1 is characterized in that: When the web plate and the bottom plate are assembled, a K-shaped groove with a blunt edge is formed between the web plate and the bottom plate.

3. The T-type fillet weld root cleaning-free welding process according to claim 2 is characterized in that: In step S1, the grooves on both sides are processed by flame cutting, and the angle of the single-side groove is 45-50 degrees, and the thickness of the blunt edge of the K-shaped groove is 0-2 mm.

4. The T-type fillet weld root cleaning-free welding process according to claim 1 is characterized in that: In step S1, the thickness of the web is 12 to 60 mm; and / or In step S2, the grinding area includes the groove and an area 20 to 30 mm away from the groove; and / or In step S3, the positioning weld is ground before welding to remove welding defects, and the end is ground to form a transition slope, and the gap between the root of the web and the bottom plate is ensured to be 0-3 mm.

5. The T-type fillet weld root cleaning-free welding process according to claim 1 is characterized in that: In step S4 and step S5, the front welding gun achieves uniform penetration and back-side forming of the root of the groove, and the rear welding gun performs remelting welding on the back-side root of the front weld.

6. The T-type fillet weld root cleaning-free welding process according to claim 1 is characterized in that: In step S4, the front welding gun is not swung during the base welding process, and the end of the welding wire of the front welding gun points to the center line of the weld and deviates 1 to 2 mm outward, the welding current is 320-330A, the welding voltage is 32-35V, the welding speed is 320-330mm / min, and the angle of the front welding gun is 30-35°.

7. The T-type fillet weld root cleaning-free welding process according to claim 1 is characterized in that: In step S4, the rear welding gun adopts a swinging or non-swinging mode during the base welding process, and the end of the welding wire of the rear welding gun points to the center line of the weld; when the rear welding gun is not swinging for welding, the welding current is 300-310A, the welding voltage is 29-30V, the welding speed is 320-330mm / min, and the angle of the welding gun is 25-30°; when the rear welding gun is swinging for welding, the welding current is 260-280A, the welding voltage is 28-30V, the welding speed is 320-330mm / min, and the angle of the rear welding gun is 25-30°.

8. The T-type fillet weld root cleaning-free welding process according to claim 1 is characterized in that: In step S5, during the filling and capping welding process, according to the plate thickness and the form of the groove, the two welding guns are used for multi-layer and multi-pass welding in a swinging or non-swinging manner, and the welding parameters of the two welding guns are as follows: welding current is 240-280A, welding voltage is 26-30V, welding speed is 320-340mm / min, and the angle of the welding gun is 30-50°; and / or The welding shielding gas is 80% Ar+20% CO2, and the welding material is a solid welding wire with a diameter of 1.2 mm that matches the material of the parent material.

9. The T-type fillet weld root cleaning-free welding process according to claim 1, characterized in that: In step S4 and step S5, an industrial robot is used for welding, and welding parameters are set before welding.

10. The T-type fillet weld root cleaning-free welding process according to any one of claims 1 to 9, characterized in that: In step S4, the front-to-back distance between the two welding guns is L, and L≥30 mm, and the two welding guns can weld at the same time or the welding operation of the rear welding gun can be performed after the front welding gun completes the front primer; and / or The following step is also included between step S3 and step S4: preheating the base material by flame heating or electromagnetic induction heating.

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