67 results about "Weld metal" patented technology

The application discloses a kind of laser welding device and welding method for heat exchanger connecting pipe processing, it is related to technical field, including welding frame, the welding frame outside is provided with welding machine, welding frame bottom is fixedly connected with mobile platform, further include: fixed plate, fixed plate is set to mobile platform mobile end, fixed plate top is provided with two mobile seats, the top of two mobile seats is fixedly connected with fixed ring, the fixed ring inside is provided with clamping mechanism, between one of fixed ring and fixed plate it is provided with screw rod for moving;The welding place of two pipe fittings is arranged in the sealed spherical shell, and the inside of it is filled with protective gas before welding, air is exhausted, oxygen is discharged during welding, reaction of metal and oxygen under high temperature is avoided to generate oxide, the purity and mechanical properties of weld metal are guaranteed.Simultaneously, after air is replaced, nitrogen, water vapor and other gases are not rolled into molten pool, significantly reduce the internal porosity defect of weld.

A method is provided for forming a large metallic component using a friction stir welded blank. A first and second metallic plate are positioned in an abutting arrangement with corresponding faying surfaces. A backing plate is attached across the abutment. The plates are friction stir welded along the faying surfaces, the friction stir weld including a weld root that terminates in the backing plate. After welding, the backing plate is removed, including the weld root, to create a welded blank. The blank is then formed into a desired component shape, heat treated and aged to produce the final large metallic component. The resulting friction stir weld has a stable microstructure with minimal or no abnormal grain growth during high-temperature forming, heat treatment, or aging.

The utility model discloses a kind of swimming pool anti-collision guardrails, including sleeve seat, pin hole one is provided on the sleeve seat, square pole is inserted on the sleeve seat, square pole is evenly distributed with pin hole two, and pin hole two branch is in the four sides of square pole, the outer sleeve of square pole is sleeved with sleeve, pin hole two is also provided on the sleeve and with the pin hole two distribution on square pole is consistent, railing is inserted between the sleeve, spacing adjusting assembly is arranged between the sleeve seat.The utility model belongs to the technical field of guardrail, specifically solve the problem that the guardrail in swimming pool is installed in prior art, take the mode of welding metal, prone to corrosion, at the same time, it is not conducive to the disassembly problem of a kind of swimming pool anti-collision guardrail in later period.

This utility model discloses a handheld laser welding device, which includes a metal gun body with an alumina ceramic nozzle and a high-frequency oscillation circuit, a rectifier filter circuit, an electronic switch circuit, and an MCU disposed within the gun body and connected in sequence. The high-frequency oscillation circuit is electrically connected to the metal gun body so that when the alumina ceramic nozzle approaches the metal workpiece, a switch signal is transmitted to the MCU through the high-frequency oscillation circuit, the rectifier filter circuit, and the electronic switch circuit. The MCU is used to turn the gun body on or off according to the switch signal. In this application, since the internal circuit has no electrical connection with the metal workpiece being welded, it has strong anti-interference ability, and the nozzle does not need to contact the workpiece, resulting in a longer service life.

This invention relates to the field of aluminum profiles, specifically disclosing a hard aluminum alloy tube and its preparation method. The preparation method includes: (1) melting and casting aluminum alloy raw materials to obtain a hard round ingot; (2) heating the hard round ingot and loading it into an extrusion cylinder; (3) using an extrusion rod to extrude the aluminum alloy in the extrusion cylinder into an extrusion die; (4) splitting the hard round ingot with a die bridge to form a metal flow along a diversion hole; (5) allowing the metal flow from the diversion hole to enter a welding chamber, and the multiple metal flows flowing out through multiple diversion holes to re-weld in the welding chamber; (6) allowing the re-welded metal flow to flow into the working zone formed between the die core and the die hole to form a rough blank; (7) quenching and aging the rough blank to obtain a hard aluminum alloy tube; wherein, the yield strength of the hard aluminum alloy tube is ≥380MPa. By implementing this invention, the forward extrusion forming of hard aluminum alloy tubes can be realized, and the mechanical properties of the tubes can be improved.

The application belongs to the technical field of plasma arc positioning welding, in particular to a positioning device for metal pipeline welding, which comprises a working base plate, a moving support frame and a multi-axis welding mechanical arm, the end of the multi-axis welding mechanical arm is fixedly provided with a plasma arc welding head, the welding station comprises a circular arc strip plate and positioning members one and two movably installed on the inner side of the top of the circular arc strip plate, the metal belt in the form of a ring outside the clamping structure is wound, the diameter of the ring is reduced, gradually adheres to the outer side of the curved part of the L-shaped metal pipe, when the metal belt is gradually tightened, the metal belt is inclined and closely adheres to the outer side of the curved part of the L-shaped metal pipe, and the clamping structure abuts against the outer side of the curved part of the L-shaped metal pipe, because the positioning member one and the positioning member two are arranged in the same way, the positioning member one and the positioning member two will exert a cross tension on the curved part of the L-shaped metal pipe, thereby positioning the curved part of the L-shaped metal pipe.

This invention discloses a method for controlling welding hot cracks with bilateral symmetrical thermal strain assistance. The method includes preparation before welding and welding. In the welding step, the temperature generated by the two induction coils is stabilized at 302±5℃ before welding begins. During welding, the welding heat source and the two induction coils move synchronously and uniformly from back to front, so that the thermal strain generated by the two induction coils continuously heats the workpieces to be welded on both sides of the weld within the brittle temperature range behind the molten pool until welding is completed. In this way, the thermal strain generated by the two induction coils continuously heats the corresponding workpieces to be welded on both sides of the weld within the brittle temperature range behind the molten pool. The thermal expansion of the workpieces generates a transverse compressive strain pointing towards the weld center in the weld metal within the brittle temperature range (BTR zone) behind the molten pool, thus counteracting the crack-inducing tensile strain generated in the brittle temperature range during welding, thereby effectively controlling the generation of hot cracks.

A lap fillet arc welding method including joining a corner formed by at least two steel sheets, wherein during the joining: the joining is performed using short-circuit transfer, a welding target position is displaced from the corner formed by the at least two steel sheets, and present at an end of an upper sheet of the at least two steel sheets, by 0.2 mm or more and 1.8 mm or less in a direction perpendicular to a weld seam of a lower sheet of the at least two steel sheets, a gas containing 98 vol % or more Ar is used as a shielding gas, and a weld metal height H (mm) and a weld metal width W (mm) of a weld satisfy expression (1): 0.2≤H / W≤1.2 . . . (1).

The present application relates to welding technology technical field, especially to a kind of metal product processing anti-deviation welding equipment, including base, the base top two sides are fixedly connected with side frame, conveying mechanism and stabilizing mechanism are installed on the side frame, first drive shell is installed on the top of the base by electric push rod, first transport roller is rotatably connected in the first drive shell, mounting bracket is slidably connected in the center position of the base one end, the mounting bracket is rotatably connected with rotating frame, processing mechanism is installed in the rotating frame end, clamping mechanism is installed in the rotating frame side wall, and collecting box is installed by the center position of the base upper side.The present application is arranged by rotating frame and multiple processing blocks, when welding metal pieces with inconsistent pipe hole diameters, the pipe with larger hole diameter is placed on the side close to the mounting bracket, the rotating disc can still contact the two metal pipes with larger area to perform related polishing and other pretreatment in the case of uneven step at the connection, and maintain internal and external multi-point support.

This utility model provides a metal welding fixing fixture, belonging to the technical field of welding fixtures. It includes a base, with adjustable clamping parts on both sides of the top of the base. Each clamping part includes a drive box fixedly mounted on the top of the base, a support rod rotatably connected to the top of the drive box, and a drive unit for driving the support rod to rotate inside the drive box. A C-shaped clamp is located on the top of the support rod, with a clamping plate slidably connected to the bottom of the C-shaped clamp. A screw threadedly connected to the side wall of the clamp is rotatably connected to one side wall of the clamp, and a handwheel located on the outside of the C-shaped clamp is located at the other end of the screw. This utility model allows the C-shaped clamp to be flexibly adjusted to a suitable horizontal or inclined position according to the needs of metal welding, with a wider adjustment range for welding metal parts fixed at multiple angles. Furthermore, no external equipment is needed to clamp and fix the metal parts to be welded, the angle adjustment operation is relatively simple, and the usage effect is greatly improved.

Provided is a flux-cored wire for welding of structures in extremely low temperature regions, which is capable of obtaining a weld metal having excellent strength and a transverse bulging amount of a desired value or more. The flux-cored wire is defined in terms of the contents of Fe, C, Cr, Ni, etc. in the total mass of the wire, and contains Nb: 0.001 to 0.15 mass%, and V: 0.005 to 0.30 mass%. In addition, the value A1 calculated from formula (1) is 0.02 to 0.30, and the value A2 calculated from formula (2) is 10.0 to 12.3. Formula (1): A1 = [Nb] + [V] Formula (2): A2 = 1.31 x (0.98 x [Cr] + [Mo] + 0.7 x [Nb]) - 1.1 x ([Ni] + 35 x [C] + 20 x [N] + 0.25 x [Cu]). Wherein, [element] is a value indicating the content of the element in the flux-cored wire in mass%. W W W W W W W W W W is a value indicating the content of the element in the flux-cored wire in mass%.​​​​​​​​​

The application discloses an automatic welding production line, and relates to the technical field of packaging material welding, which comprises a supporting machine, a welding device and a conveying assembly, a moving assembly is arranged on the top of the supporting machine, and a supporting assembly is arranged on the outer wall of the supporting machine. Through the arrangement of the conveying assembly and the overturning assembly, the transmission and overturning of the fully welded metal paint bucket are realized. The fully welded metal paint bucket is conveyed to the subsequent process through the conveying assembly. During the conveying process, the metal paint bucket is automatically overturned left and right under the overturning assembly. In this way, the process circulation time of a single workpiece is greatly shortened, which is especially suitable for batch production scenes and significantly improves the overall production capacity of the production line. Moreover, the overturning action is more gentle, which not only protects the surface integrity of the packaging bucket, but also guarantees the product quality.

A kind of joint welding machine for metal packaging can processing, the present application relates to metal intelligent welding equipment technical field, it includes frame, upper welding wheel component, lower electrode bar and pressing mechanism;The bottom of the crossbeam of frame is equipped with horizontal slide rail, and the pressing mechanism is movably installed on horizontal slide rail using horizontal sliding block, and the upper welding wheel component is installed on the pressing mechanism;The pressing mechanism is movably connected on horizontal nut in horizontal drive screw pair;Lower electrode bar is correspondingly arranged below upper welding wheel component;The lower side of lower electrode bar is provided with clamping mechanism;Lower electrode bar and clamping mechanism are rotatably installed on frame using rotating mechanism, and the upper portion of lower electrode bar is equipped with insulating baffle, it can be adjusted according to the diameter of metal can to be welded, improve adaptability;And have clamping positioning mechanism, can avoid the position deviation of metal packaging can body in the process of feeding welding, improve welding stability, improve welding quality.

A foldable, heavy-duty drone frame made of welded metal square tubing includes: a main frame 1, upper and lower lateral folding components 2, landing gear 3, arm tubes, and skid tubes 5. The main frame 1 carries various equipment of the drone and has a two-layer structure connected by a connecting structure. The upper and lower arm tubes are foldable. The main frame, lateral folding components, landing gear 3, upper and lower arm tubes, and skid tubes are all made of metal square tubing. The staggered distribution of the upper and lower arm tubes reduces the overall wheelbase, lowers the overall rigidity requirements, and avoids the problem of insufficient rigidity in the arm tubes and fuselage caused by a large wheelbase, thus ensuring the reliability of the drone's arm structure during operation. The staggered distribution of the upper and lower arm tubes (4A and 4B) and the lateral folding components reduce both the overall height and length / width of the drone, facilitating transportation and relocation, improving maintenance convenience, and reducing packaging and transportation costs. Compared to solutions using carbon fiber materials, the present invention uses a metal square tube technology solution, which reduces material costs and design complexity.

The present application relates to the technical field of welding material, and discloses a kind of ultra-low carbon bainite high-strength steel matched flux-cored wire for high-speed train bogie and welding method.The flux-cored wire of the present application includes outer skin and flux filled in the outer skin, and the flux includes the following components by mass fraction: sodium fluoride 23-28%, CaCO3 8-15%, sodium titanate 12-15%, natural rutile 5-10%, potassium feldspar 4-7%, electrolytic manganese 6-10%, ferrosilicon 4-6%, nickel powder 6-9%, copper powder 0.5-0.8%, molybdenum iron 2.5-4%, niobium iron 0.2-0.3%, titanium iron 1.2-1.8%, and iron powder 8.6-13.1%.The flux-cored wire of the present application is used for welding of the steel in the manufacture of high-speed train bogie frame, and the weld metal has excellent strength, toughness and corrosion resistance, the weld is fine and has low risk of fatigue cracking, and meets the high standard requirements in the manufacture and service of high-speed train bogie.

This invention discloses a welding device for splicing seams and its application in bridge splicing, relating to the field of welding equipment technology. It solves the problem of high temperatures at the seams of welded metal materials affecting the welding quality and subsequent inspection of weld quality. The splicing seam welding device includes a concave base, rollers, a traveling cooling mechanism, a support column, a seam welding mechanism, and a pusher. Multiple rollers are movably connected to the inner bottom of the concave base, and two rollers are connected to the traveling cooling mechanism, which is installed on the side of the concave base. In this invention, the traveling shaft that drives the rollers and the device to rotate rotates, driving multiple cooling fan blades to rotate and automatically cool the weld area. This ensures that the accuracy of subsequent welding quality inspection of the weld area is not easily affected by residual high temperatures. It also improves the overall quality of metal welding.

The utility model discloses a novel composite board welding structure relates to the technical field of composite board welding, including base layer, intermediate layer and complex layer, base layer, intermediate layer and complex layer are fixed together, two adjacent intermediate layer and complex layer between be provided with the shim, the lower surface of shim is provided with the pad strip, and the outer surface of pad strip is connected with complex layer, the inner wall of pad strip is provided with the gap, and the both sides of pad strip located gap all are provided with leak detection hole. The utility model discloses design structure is reasonable, it through the intermediate layer and complex layer of two sides of butt joint place each plan away certain area scope, fills the shim of a piece zirconium material to the area of plan away before, so as to shut up between base layer and intermediate layer, prevent both intercommunication, thereby solved the existing when welding base layer, the melted base layer metal can mix into complex layer weld metal, lead to the alloy element content reduction of complex layer weld, reduced the corrosion resistance or high temperature performance problem.

This invention discloses a post-weld heat treatment process for improving the impact toughness of Q690C high-strength steel weld metal used in tunnel embedded parts, belonging to the field of steel structure welding and heat treatment technology. The process employs a two-stage heat treatment method: first, the weld is heated to 680–700 °C and held for 1.5–2.0 h to decompose residual austenite and coarse tempered martensite; then, it is slowly cooled to 600–620 °C and held for 2.0–2.5 h to promote the precipitation of dispersed carbides and refine the microstructure; finally, it is cooled in the furnace to 300 °C and then air-cooled to avoid secondary embrittlement. After this process, the weld metal microstructure consists of uniform and fine tempered sorbite + dispersed carbides, and the residual stress is significantly reduced. Its mechanical properties are: yield strength ≥680 MPa, tensile strength ≥750 MPa, and impact energy at -40 °C increased to 80–95 J, which is more than 40% higher than that of conventional tempering or normalizing processes.

This invention relates to a vision-based welding defect detection device, which mainly consists of a conveyor belt, a label reader, an L-shaped support, x-y-z direction displacement adjustment components, an industrial camera, and a computer terminal. The conveyor belt transports the welded metal sheet, the label reader reads the QR code label on the sheet and transmits the product information to the computer terminal, the industrial camera adjusts its position in the x, y, and z directions via the displacement adjustment components, the computer terminal determines the optimal shooting position based on the product information and controls the camera, simultaneously acquiring the captured images for defect detection analysis, and storing the detection results in association with the product information. Compared with existing technologies, this invention can achieve automated and precise detection of welding defects in different metal sheets, effectively improving detection efficiency and accuracy, meeting the needs of strict welding quality control in industrial production, and has broad application prospects.

The present invention provides a battery case (1) comprising a lid (11) and a body (12), wherein the lid (11) and the body (12) are joined by crimping, the lid (11) is made of any of stainless steel, plated steel, painted steel, or aluminum, the body (12) includes a base steel material and a Ni-plated steel material having a Ni-based plating layer, the body (12) includes at least one weld metal (30) extending in a direction intersecting the lid (11), and when the average Cr content of the weld metal (30) is [Cr] and the average Ni content of the weld metal (30) is [Ni], the equation [Cr] + 4 × [Ni] ≥ 5.00 is satisfied.

The present invention provides a welded joint, a mechanical structural member, an automotive member, and a method for manufacturing a welded joint, which can be easily manufactured, ensure corrosion resistance of metal plates at the mating surface, and suppress blowholes in the weld metal. [Solution] A welded joint according to one aspect of the present disclosure comprises a weld having stacked metal plates and a weld metal that joins the metal plates, wherein one or more metal plates are zinc-plated metal plates having a zinc-plated layer on one or both surfaces, the one or more zinc-plated layers are arranged on the mating surfaces of the metal plates, the boiling point of the zinc-plated layer arranged on the mating surface is lower than the melting point of all the metal plates joined by the weld metal, a first plating thickness reduction portion is provided in the zinc-plated layer inside the weld at the mating surface, the thickness of the zinc-plated layer in the first plating thickness reduction portion is 1.0 μm or more and 30.0 μm or less, and the first plating thickness reduction portion surrounds the weld metal at the mating surface.

This invention relates to a 1000MPa-grade low-temperature, high-toughness all-position welding electrode for marine engineering and its preparation method, belonging to the field of welding electrode technology. It addresses at least one of the problems of existing methods in preparing welding electrodes, such as poor strength-toughness matching, high cost, and inability to meet the requirements of 1000MPa-grade marine engineering steel. The welding electrode of this invention, through the synergistic effect of the core and coating, and the optimization of the alloying elements in the weld metal, ensures good matching between the welding material performance and the 1000MPa-grade marine engineering steel base material, meeting the construction requirements for all-position welding of steel structures. It exhibits good processability, excellent mechanical properties of the deposited metal, and good all-position welding performance. Specifically, the tensile strength of the deposited metal is >1000MPa, the yield strength is ≥980MPa, the KV2 at -50℃ is ≥50J, the tensile strength of the weld joint is ≥1000MPa, the KV2 of the weld metal at -50℃ is ≥32J, and the KV2 of the heat-affected zone at -50℃ is ≥61J. It has good adaptability to all-position welding, meeting the requirements for horizontal, vertical, and flat welding positions.

The application relates to the technical field of welding materials, in particular to a continuous oil pipe butt welding gas protection solid core welding wire and a welding method; the chemical components of the solid core welding wire include the following: C: 0.08%-0.14%, Si: 0.2%-0.3%, Mn: 0.7%-1.0%, Ni: 0.15%-0.25%, Cu: 0.25%-0.35%, Cr: 0.5%-0.7%, Mo: 0.10%-0.15%, Nb: 0.02%-0.03%, Ti: 0.01%-0.02%, and the rest is Fe and inevitable impurities; by adopting low-carbon components, the fatigue performance of a weld is reduced, then the Mn, Ni, Mo, Cr and Cu systems are adopted, and i and Nb trace elements are added at the same time, so that the solid solution strengthening, fine-grain strengthening and precipitation strengthening methods can be comprehensively utilized to improve the strength of the weld, the hardenability of the weld metal is improved, the generation of bainite is promoted, the toughness and strength of the metal weld are improved, and therefore the fatigue resistance of a pipe-pipe butt welding joint is comprehensively improved.

This invention provides a polymer diffusion welding device for steel-aluminum composite bars, belonging to the field of welding equipment technology. It includes a machine body with a welding auxiliary assembly on one side. The welding auxiliary assembly consists of a fixing assembly and a feeding assembly. The feeding assembly includes a mounting plate fixedly connected to one side of the machine body. Multiple movable bolts are slidably connected to one side of the mounting plate, and a movable connecting plate is slidably connected to one side of the mounting plate on the outer side of the multiple movable bolts. This invention uses the welding auxiliary assembly to specifically fix and adapt multi-layer materials such as steel and aluminum, and can feed materials to the required dimensions, ensuring the neatness and welding accuracy of the welded metal materials. This results in a neat rectangular outline after welding, meeting the required welding length, thereby improving welding efficiency. Furthermore, this device has a low cost, meeting the demand for low-cost solutions.

The application discloses a low-cost large-heat-input welding method for common high-strength steel, selects common high-strength steel plates with thickness of 20mm-120mm and tensile strength of 450-650MPa as base materials, firstly melts thin-layer weld metal in a groove by small-line-energy gas shielded welding, forms fine and dispersed inclusions in the weld by Ti, Si, Al and Mn oxides and MnS complex, and induces generation of slender acicular ferrite (AF) structure, and then completes welding by vertical gas-electric vertical welding with large heat input, so that the thin-layer weld metal is used as new heat affected zone (HAZ), the inclusions inhibit austenite grain growth, and the AF structure is transformed into equiaxed ferrite. The application can realize large-heat-input efficient welding of common high-strength steel without special large-heat-input welding steel, the low-temperature impact toughness of each region of the joint is excellent, the material cost is greatly reduced, the welding efficiency is improved, and the application is suitable for thick plate welding fields such as shipbuilding and offshore platform.

The utility model relates to liquid cooling equipment technical field more specifically, relate to a kind of for the head board of liquid cooling tank and liquid cooling tank, the head board includes board main body and first plugging, the inside of board main body is equipped with first cooling flow channel, multiple flow channel interfaces are distributed in first cooling flow channel, the first plugging is tightly connected in first cooling flow channel to the first cooling flow channel is separated into at least two flow channel sections, each flow channel section has flow channel interface.The utility model's liquid cooling tank is assembled using above-mentioned head board.Compared with the mode that the existing welding metal block separates cooling flow channel, the utility model can avoid welding seam in separation position, at least the number of welding seam can be reduced as a whole, to reduce the hidden danger of coolant leakage.

The present invention provides a welded joint in a welded structure that has excellent tensile strength and yield strength, preventing fracture in the weld metal or heat-affected zone (HAZ), and also provides a welding method for obtaining such a welded joint. [Solution] A welded joint for a welded structure, wherein the cross-sectional shape of the welded joint parallel to the surface of the base material is such that the width of the HAZ (Hammer Zone) periodically repeats irregularities, and this shape is the shape at a position 2 mm below the surface of the base material. Furthermore, it is preferable that the difference between the maximum and minimum values ​​of the HAZ width at a position 2 mm below the surface of the base material is 3 mm or more. The welding method is a gas shielded arc welding method in which the tip of the wire is stopped just before it touches one groove surface, the tip of the wire is brought into contact with the groove surface at the moment the groove surface melts, then quickly moved away from that groove surface and moved to the other groove surface or the same groove surface, and the same operation is repeated periodically to weld while moving the groove surface in the direction of progression.

This utility model discloses a test device for the interfacial shear strength of welded metal parts, relating to the field of material performance testing technology. It includes a strength testing frame, a hydraulic cylinder, and a shear test sample. A microcontroller is mounted at the top of the strength testing frame. A hydraulic cylinder is located at the top inside the strength testing frame, and a vertical rod is installed at the output end of the hydraulic cylinder. A sample placement rack is installed at the bottom inside the strength testing frame, and a column is mounted at the top of the sample placement rack. A crossbeam connected to the column is fitted onto the outer wall of the column. A pressure sensor is mounted at the top of the sample placement rack, and a shear test sample is placed above the pressure sensor. A pressure sensor is attached to the top of the shear test sample using double-sided adhesive. The device uses a microcontroller to analyze and process the data, transmitting it to a display for visual viewing of the obtained load and deformation data, thus facilitating the operator's understanding of the interfacial shear strength of the shear test sample.

This invention discloses a method for welding metal pipelines. The metal pipelines to be welded include a main pipe and branch pipes. The main pipe has a joint on its side wall, which includes a flared section and a straight section. The thermal expansion coefficient of the branch pipe material is greater than that of the joint. The welding method includes: inserting the branch pipe into the straight section to form an assembly gap; heating the flared section, with heat conducted to the main pipe, resulting in a lower temperature at the bottom of the straight section; the solder melting and penetrating into the gap; under continuous heating, the large radial thermal expansion of the branch pipe causes the assembly gap to contract and compress the liquid solder, while the liquid solder at the bottom solidifies to prevent overflow into the main pipe; when heating stops and cooling occurs, the large radial contraction of the branch pipe causes the gap to widen, creating a suction effect, and the remaining liquid solder continues to penetrate into the gap until the entire structure solidifies. This invention utilizes the thermal expansion difference between dissimilar metals to convert thermal deformation into a driving force for deep and dense penetration of the solder, effectively preventing incomplete welds and pipeline blockage.

This invention provides a Hastelloy pipe welding method. Before welding, degreasing is performed using sulfur-free acetone or ethanol. High-purity argon gas is used during welding. A large angle and small blunt edge are selected for the bevel. Welding is performed using low welding heat input, a short arc, and minimal or no oscillation. This invention effectively prevents the addition of carbon, oxygen, and hydrogen to the weld, thus preventing porosity and cracks and reducing the mechanical properties of the weld metal. It reduces the number and probability of porosity caused by harmful gases. It effectively addresses the poor fluidity and wettability of the weld pool and shallow penetration of nickel-based alloys, which easily lead to defects such as incomplete fusion and incomplete penetration. It effectively prevents defects such as incomplete fusion and inclusions caused by the high melting point of the oxide layer on the surface of nickel-based alloys. It prevents impurities such as sulfur, phosphorus, and carbon from entering the weld and forming welding hot cracks. It improves the utilization rate of expensive nickel-based alloy materials. It reduces labor time and improves welding efficiency and quality.