Welding equipment and welding process for high alloy steel pipe fittings

Abstract

The present invention relates to the technical field of steel pipe welding, and discloses a welding device for high-alloy steel pipe fittings and a welding process thereof, comprising a welding table, a bent pipe, a straight pipe, and a telescopic member arranged on the side of the welding table, wherein a first motor is installed on the telescopic end of the telescopic member, the output shaft of the first motor is connected to a mounting plate, a positioning column is rotatably arranged on the side of the mounting plate, a positioning piece is movably arranged on the side of the positioning column, the positioning piece is used to support and position the straight pipe, a clamping piece for fixing the bent pipe is arranged on the side of the welding table, and a welding gun is arranged on the side of the mounting plate. The telescopic member drives the straight pipe to approach the bent pipe, the clamping piece clamps the bent pipe, and the positioning piece expands outward to drive the straight pipe to move until the positioning piece on the left side fits with the inner wall of the bent pipe and the positioning piece on the right side fits with the inner wall of the straight pipe, aligning the straight pipe welding surface with the bent pipe welding surface, and the first motor drives the welding gun to rotate one circle along the weld between the bent pipe and the straight pipe through the mounting plate, thereby welding the bent pipe and the straight pipe, thereby improving welding efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe welding, in particular to welding equipment for high-alloy steel pipe fittings and a welding process thereof. Background Art

[0002] The equipment for welding high-alloy steel pipe fittings mainly includes welding machines and auxiliary equipment. Welding machines can be divided into various types according to different welding methods, such as: laser welding machines: suitable for high-precision and high-efficiency welding needs; TIG welding machines: suitable for welding thin plates and small-diameter high-alloy steel pipe fittings; SMAW welding equipment: suitable for welding high-alloy steel pipe fittings with thicker walls or larger diameters. SMAW welding has high flexibility and adaptability and can cope with various complex welding conditions.

[0003] The welding of high-alloy steel pipe fittings usually includes steps such as pre-weld preparation, preheat treatment, welding operation, and post-weld treatment. Pre-weld preparation: thoroughly clean the groove and surrounding surfaces to remove impurities such as oil, rust, etc. until the metallic luster is exposed, check the assembly of the welds to avoid folding and misalignment, select appropriate welding materials according to welding requirements, and dry them; Preheat treatment: preheat the weld groove and both sides. The preheating temperature depends on the type and thickness of the material. Preheating can reduce welding stress and deformation and prevent cracks during welding. The preheating method can be flame heating, flexible ceramic resistance heating, etc. During preheating, the heating width and insulation width requirements should be ensured; Welding operation: select appropriate welding methods and parameters according to welding requirements. For example, for thin plates or small-diameter high-alloy steel pipe fittings, TIG welding method can be used. For thicker walls or larger diameters, a combined welding method of TIG+SMAW can be used.

[0004] At present, when welding large-sized curved pipes and straight pipes, the existing technology requires workers to first align the welding surface using tools such as rulers and levels, then weld multiple welding points on the weld for pre-fixing, and finally transfer the weldment to the welding table for welding. However, this consumes a lot of manpower and time, which easily affects the welding efficiency; therefore, it does not meet the existing needs. In this regard, we propose a welding equipment and welding process for high-alloy steel pipe fittings. Summary of the Invention

[0005] The present invention provides a welding device and a welding process for high-alloy steel pipe fittings, which has the beneficial effect of facilitating the rapid and effective calibration and alignment of weldments, thereby improving welding efficiency. It solves the problem mentioned in the above background technology that in the prior art, when welding large-sized curved pipes and straight pipes, workers are required to first use tools such as rulers and levels to calibrate and align the welding surfaces, then weld multiple welding points on the weld for pre-fixing, and finally transfer the weldment to the welding table for welding. However, this consumes a lot of manpower and time, which easily affects the welding efficiency.

[0006] The present invention provides the following technical solution: a welding device for high-alloy steel pipe fittings, comprising a welding table and a telescopic part arranged on the side of the welding table, wherein a bent pipe and a straight pipe for welding are arranged on the upper side of the welding table, a first motor is installed on the telescopic end of the telescopic part, and the output shaft of the first motor is connected to a mounting plate, a positioning column is rotatably provided on the side of the mounting plate, a positioning plate is movably provided on the side of the positioning column, and the positioning plate is used to support and position the straight pipe, a clamping plate for fixing the bent pipe is provided on the side of the welding table, a support rod is slidably inserted on the side of the mounting plate, a welding gun is provided at the end of the support rod, and the welding gun moves in a circular motion along the weld seam of the bent pipe and the straight pipe.

[0007] As an optional solution for the welding equipment of a high-alloy steel pipe fitting described in the present invention, a screw is rotatably arranged on the inner side of the welding table, a wire sleeve is threadedly connected to the outer side of the screw, the number of the wire sleeves is set to two, the screw is set to a bidirectional screw, and the two wire sleeves are respectively arranged on the reverse threads of the screw.

[0008] As an optional solution for the welding equipment of a high-alloy steel pipe fitting described in the present invention, the number of the clamping plates is also set to two, the two clamping plates are respectively connected to the two wire sleeves, the clamping plates are both set to arc plates, the two clamping plates together form a circular ring, and the two clamping plates are both slidably set on the upper side of the welding table.

[0009] As an optional solution for the welding equipment of a high-alloy steel pipe fitting described in the present invention, wherein: the end of the screw rod is sleeved with a first gear, a first rack is slidingly set on the inner side of the welding table, the first rack is engaged with the first gear, and the telescopic end of the telescopic part is also installed with a connecting rod, the connecting rod is set to "L" shape, the lower end of the connecting rod is slidably inserted into the side of the welding table, and the end of the connecting rod located on the inner side of the welding table is connected to the first rack.

[0010] As an optional solution for the welding equipment of a high-alloy steel pipe fitting described in the present invention, a circular plate is installed at the end of the positioning column, a circular ring is concentrically arranged on the side of the circular plate, a sliding plate is arranged between the circular plate and the circular ring, the number of the sliding plates is set to several, and the several sliding plates are arranged equidistantly in the circumferential direction.

[0011] As an optional solution for the welding equipment of a high-alloy steel pipe fitting described in the present invention, wherein: riveting rods are installed on both sides of the sliding plate, a straight groove for cooperating with the riveting rod is opened on the side of the circular plate, and an arc groove for cooperating with the riveting rod is opened on the side of the circular ring, the riveting rods on both sides of the sliding plate are slidably inserted into the straight groove and the arc groove respectively, and a limiting slide is further installed on the side of the sliding plate close to the circular plate, and a limiting slide groove for cooperating with the limiting slide is opened on the side of the circular plate, and the limiting slide is slidably inserted in the limiting slide groove;

[0012] The ends of the sliding plates are each installed with a straight rod, the straight rod is located outside the circular plate and the circular ring, the positioning pieces are installed at both ends of the straight rod, and the side portions of the positioning pieces close to the telescopic part are connected with convex strips, a straight tube is sleeved outside the positioning piece close to the telescopic part, and the side wall of the end of the straight tube is in conflict with the convex strip.

[0013] As an optional solution for the welding equipment of a high-alloy steel pipe fitting described in the present invention, a shell is installed on the outside of the positioning column, a second motor is installed on the outside of the shell, the second motor is configured as a double-headed motor, a second gear is installed on the output shaft of the second motor near one end of the circular ring, a tooth groove is opened on the inner ring of the circular ring, and the second gear is engaged with the tooth groove.

[0014] As an optional solution for the welding equipment of a high-alloy steel pipe fitting described in the present invention, a third gear is provided on the inner side of the shell, the output shaft at the other end of the second motor is rotatably inserted into the side of the shell, the third gear is transmission-connected with the output shaft at the other end of the second motor, a second rack is slidingly provided on the inner side of the shell, the third gear is engaged with the second rack, and a first airbag is also provided inside the shell, and the two ends of the first airbag are respectively connected to the second rack and the inner wall of the shell.

[0015] As an optional solution for the welding equipment of a high-alloy steel pipe fitting described in the present invention, wherein: the support rod is set to an "L" shape, the lower end of the support rod is slidably inserted into the side of the mounting plate, a second airbag is provided on the inner side of the mounting plate, the upper end of the second airbag is connected to the inner wall of the mounting plate, the lower end of the second airbag is connected to the support rod, an air pipe is connected between the first airbag and the second airbag, and the air pipe is set to a corrugated tube.

[0016] The present invention also provides a welding process for high alloy steel pipe fittings, comprising the following specific steps:

[0017] S1. Positioning the elbow and straight pipe: The straight pipe is placed on the positioning piece on the side close to the telescopic member, the straight pipe is driven close to the elbow by the telescopic member, and the elbow is clamped and fixed by the clamping piece;

[0018] S2. Aligning the weld surface of the bent pipe with the weld surface of the straight pipe: The positioning piece is expanded outward, driving the straight pipe to move in the vertical plane so that the center of the straight pipe and the center of the bent pipe are on the same horizontal line, thereby aligning the weld surface of the straight pipe with the weld surface of the bent pipe;

[0019] S3. Welding of the bent pipe and the straight pipe: The welding gun rotates one circle along the weld between the bent pipe and the straight pipe to complete the welding.

[0020] The present invention has the following beneficial effects:

[0021] 1. The welding equipment and welding process of the high-alloy steel pipe fittings are as follows: the telescopic part drives the straight pipe close to the bent pipe, so that the positioning piece on the left is inserted into the pipe mouth of the bent pipe. At the same time, the two clamping pieces clamp and fix the bent pipe, and then the positioning piece expands outward to drive the straight pipe to move until the positioning piece on the left is in contact with the inner wall of the bent pipe and the positioning piece on the right is in contact with the inner wall of the straight pipe, thereby supporting and fixing the straight pipe and overlapping and aligning the welding surface of the straight pipe with the welding surface of the bent pipe. Finally, the first motor drives the mounting plate to rotate, so that the mounting plate drives the welding gun to rotate one circle along the weld of the bent pipe and the straight pipe through the support rod, thereby welding the bent pipe and the straight pipe, thereby improving welding efficiency.

[0022] 2. The welding equipment and welding process of the high-alloy steel pipe fittings, the second motor drives the second gear to rotate, and the engagement of the second gear and the tooth groove causes the circular ring to rotate, so that the riveted rods on the left and right sides of the sliding plate slide in the straight groove and the arc groove respectively, driving the sliding plate to drive the positioning piece to slide outward and expand through the straight rod, so that the positioning piece on the left side fits with the inner wall of the bent pipe, and the positioning piece on the right side fits with the inner wall of the straight pipe. In summary, it is convenient to align and calibrate the welding surface of the straight pipe with the welding surface of the bent pipe by controlling the movement of the positioning piece, thereby further improving the welding efficiency.

[0023] 3. The welding equipment and welding process of the high-alloy steel pipe fittings are as follows: the second motor drives the third gear to rotate, and through the engagement of the third gear and the second rack, the second rack is driven to compress the first airbag, so that the gas in the first airbag enters the second airbag through the air pipe, causing the second airbag to extend downward, driving the support rod to move downward, so that the support rod drives the welding gun to descend, making it easier to place the welding gun close to the weld position, thereby improving the welding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the internal three-dimensional structure of the present invention.

[0025] Figure 2 It is an exploded view of the local structure of the present invention.

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention.

[0027] Figure 4 It is a partial cross-sectional structural schematic diagram of the present invention.

[0028] Figure 5 It is a schematic diagram of the cutaway structure of the shell of the present invention.

[0029] Figure 6 It is a schematic diagram of the three-dimensional structure of the clamping piece of the present invention.

[0030] Figure 7 It is a schematic diagram of the local three-dimensional structure of the present invention.

[0031] Figure 8 This is a schematic diagram of the straight pipe sleeve positioning piece structure of the present invention.

[0032] Figure 9 It is a schematic diagram of the outward expansion structure of the positioning piece of the present invention.

[0033] Figure 10 It is a schematic diagram of the sliding plate sliding outward structure of the present invention.

[0034] In the figure: 100, welding table; 130, telescopic member; 140, first motor; 150, mounting plate; 160, positioning column; 170, positioning plate; 180, clamping plate; 181, screw rod; 182, screw sleeve; 183, first gear; 184, first rack; 185, connecting rod; 190, support rod; 200, welding gun; 210, circular plate; 211, circular ring; 212, sliding plate; 220, riveted rod; 221, straight groove; 222, arc groove; 224, limiting slide groove; 225, straight rod; 226, convex strip; 227, housing; 228, second motor; 229, second gear; 230, tooth groove; 231, third gear; 232, second rack; 233, first airbag; 234, second airbag; 235, trachea. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] Example 1: This example aims to solve the problem that in the prior art, when welding large-sized curved pipes and straight pipes, workers need to first align the welding surface using tools such as a ruler and a level, then weld multiple weld points on the weld to pre-fix it, and finally transfer the weldment to the welding table for welding. However, this consumes a lot of manpower and time, which easily affects the welding efficiency. Please refer to Figure 1 、 Figure 3 、 Figure 4 、 Figure 6 、 Figure 8 and Figure 9 A welding device for high-alloy steel pipe fittings includes a welding table 100 and a telescopic member 130 fixedly arranged on the side of the welding table 100. The telescopic member 130 is configured as an electric lifting rod or a hydraulic cylinder. Bend pipes and straight pipes for welding are arranged on the upper side of the welding table 100.

[0037] The telescopic end of the telescopic member 130 is fixedly installed with a first motor 140, and the output shaft of the first motor 140 is fixedly connected to a mounting plate 150. The mounting plate 150 is set in a circular plate shape. A positioning column 160 is rotatably set at the center of the mounting plate 150. A plurality of positioning plates 170 are movably set on the side of the positioning column 160, and the plurality of positioning plates 170 are circumferentially surrounding the outside of the positioning column 160. The positioning plates 170 are used to support and position the straight tube.

[0038] See Figure 3 and Figure 6 A clamping piece 180 for fixing the bent pipe is provided on the upper side of the welding table 100, and a screw rod 181 is rotatably provided on the inner side of the welding table 100 through a bearing. A wire sleeve 182 is threadedly connected to the outer side of the screw rod 181, and the number of wire sleeves 182 is set to two. The screw rod 181 is set to a bidirectional screw rod, and the two wire sleeves 182 are respectively set on the reverse threads of the screw rod 181. The number of clamping pieces 180 is also set to two, and the two clamping pieces 180 are respectively fixedly connected to the two wire sleeves 182. The clamping pieces 180 are both set to arc pieces. The two clamping pieces 180 together form a circular ring. The two clamping pieces 180 are both slidably provided on the upper side of the welding table 100, and the two clamping pieces 180 are respectively located on both sides of the bent pipe.

[0039] The interference sleeve at the end of the screw rod 181 is provided with a first gear 183, and a first rack 184 is slidingly provided on the inner side of the welding table 100, and the first rack 184 is engaged with the first gear 183. The telescopic end of the telescopic member 130 is also fixedly installed with a connecting rod 185, and the connecting rod 185 is set to an "L" shape. The lower end of the connecting rod 185 is slidably inserted into the upper side of the welding table 100, and the end of the connecting rod 185 located on the inner side of the welding table 100 is fixedly connected to the first rack 184. The side of the mounting plate 150 is slidably inserted with a support rod 190, and a welding gun 200 is provided at the end of the support rod 190. The welding gun 200 performs a circular motion along the welds of the bent pipe and the straight pipe.

[0040] The present invention also provides a welding process for high alloy steel pipe fittings, comprising the following specific steps:

[0041] S1. Positioning of the elbow and straight pipe: The straight pipe is set on the positioning piece 170 near the telescopic member 130 on one side, and the straight pipe is driven close to the elbow by the telescopic member 130, and the elbow is clamped and fixed by the clamping piece 180;

[0042] S2. Aligning the weld surface of the elbow and the weld surface of the straight pipe: By expanding the positioning piece 170 outward, the straight pipe is moved vertically so that the center of the straight pipe and the center of the elbow are on the same horizontal line, thereby aligning the weld surface of the straight pipe with the weld surface of the elbow;

[0043] S3. Welding of the bent pipe and the straight pipe: The welding gun 200 rotates one circle along the weld seam between the bent pipe and the straight pipe, thereby completing the welding.

[0044] In this embodiment, the bent pipe is placed on the welding table 100 and located between the two clamping pieces 180. The straight pipe is sleeved on the right positioning piece 170 from left to right. The telescopic member 130 drives the positioning piece 170 and the straight pipe thereon to approach the bent pipe through the positioning column 160, so that the left positioning piece 170 is inserted into the pipe mouth of the bent pipe. During this process, the telescopic member 130 also drives the first rack 184 to move through the connecting rod 185. The engagement of the first rack 184 and the first gear 183 causes the screw rod 181 to rotate. Then, the screw rod 181 and the wire sleeve 182 cooperate with each other to make the two wire sleeves 182 drive the two clamping pieces 180 to clamp and fix the bent pipe.

[0045] Subsequently, the positioning piece 170 slides outward and expands, driving the straight pipe to move on the vertical plane until the positioning pieces 170 on the left side are all in contact with the inner wall of the bent pipe. At the same time, the positioning pieces 170 on the right side are all in contact with the inner wall of the straight pipe, thereby supporting and fixing the straight pipe while making the welding surface of the straight pipe overlap and align with the welding surface of the bent pipe. Finally, the first motor 140 drives the mounting plate 150 to rotate, so that the mounting plate 150 drives the welding gun 200 to rotate one circle along the weld between the bent pipe and the straight pipe through the support rod 190, thereby welding the bent pipe and the straight pipe, improving welding efficiency, and solving as much as possible the problem that when welding large-sized bent pipes and straight pipes in the existing technology, workers need to first use tools such as rulers and levels to calibrate and align the welding surface, and then weld multiple welds on the weld for pre-fixing, and finally transfer the weldment to the welding table for welding. However, this consumes a lot of manpower and time, which easily affects the welding efficiency.

[0046] It should be noted that during the first welding, the first motor 140 drives the welding gun 200 to rotate clockwise, and during the second welding, the first motor 140 drives the welding gun 200 to rotate counterclockwise, and so on, to avoid the welding gun 200 always rotating in one direction and causing the air pipe 235 to be entangled.

[0047] Embodiment 2: This embodiment is intended to further promote the solution of the problem that it is difficult to control the movement of the positioning piece 170, and it is difficult to align and calibrate the welding surface of the straight pipe with the welding surface of the bent pipe, which easily affects the welding efficiency. This embodiment is an improvement made on the basis of embodiment 1. For details, please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 7 、 Figure 8 Figure 9 and Figure 10 A circular plate 210 is fixedly installed at the end of the positioning column 160, a circular ring 211 is concentrically arranged on the side of the circular plate 210, and a sliding plate 212 is arranged between the circular plate 210 and the circular ring 211. The number of sliding plates 212 is set to be several, and the several sliding plates 212 are equidistantly arranged around the positioning column 160.

[0048] See Figure 1 and Figure 2The rivet rods 220 are fixedly installed on both sides of the sliding plate 212, and a straight groove 221 is opened on the side of the circular plate 210 for cooperating with the rivet rod 220, and an arc groove 222 is opened on the side of the ring 211 for cooperating with the rivet rod 220. The rivet rods 220 on both sides of the sliding plate 212 are slidably inserted in the straight groove 221 and the arc groove 222 respectively. A limiting slide is also fixedly installed on the side of the sliding plate 212 close to the circular plate 210, and a limiting slide 224 is opened on the side of the circular plate 210 for cooperating with the limiting slide. The limiting slide is slidably inserted in the limiting slide 224, thereby limiting the sliding of the sliding plate 212 to prevent the sliding plate 212 from rotating with the rivet rod 220 as the center.

[0049] See Figure 8 and Figure 9 The ends of the sliding plate 212 are fixedly installed with straight rods 225, and the straight rods 225 are located outside the circular plate 210 and the ring 211. Positioning pieces 170 are fixedly installed at both ends of the straight rods 225, and the sides of the positioning pieces 170 close to the telescopic member 130 are fixedly connected with convex strips 226. The straight tube is sleeved on the outside of the positioning piece 170 close to the telescopic member 130, and the side wall of the end of the straight tube conflicts with the convex strip 226 to prevent the straight tube from detaching from the positioning piece 170.

[0050] See Figure 1 A shell 227 is fixedly installed on the outside of the positioning column 160, and a second motor 228 is installed on the outside of the shell 227. The second motor 228 is set as a double-headed motor. The output shaft of the second motor 228 close to one end of the ring 211 is fixedly installed with a second gear 229. A tooth groove 230 is opened on the inner ring of the ring 211, and the second gear 229 is engaged with the tooth groove 230.

[0051] In this embodiment: the second motor 228 drives the second gear 229 to rotate, and the engagement of the second gear 229 and the tooth groove 230 causes the ring 211 to rotate, so that the riveted rods 220 on the left and right sides of the sliding plate 212 slide in the straight groove 221 and the arc groove 222 respectively, driving the sliding plate 212 to drive the positioning piece 170 to slide outward and expand through the straight rod 225, so that the positioning piece 170 on the left side fits with the inner wall of the bent pipe, and the positioning piece 170 on the right side fits with the inner wall of the straight pipe. In summary, it is convenient to align and calibrate the welding surface of the straight pipe with the welding surface of the bent pipe by controlling the movement of the positioning piece 170, thereby further improving the welding efficiency.

[0052] Embodiment 3: This embodiment aims to solve the problem that it is inconvenient to place the welding gun 200 close to the weld, which easily affects the welding effect. This embodiment is an improvement made on the basis of embodiment 1. For details, please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 、 Figure 7 、 Figure 8 Figure 9 and Figure 10 A third gear 231 is rotatably mounted inside the housing 227. The output shaft at the other end of the second motor 228 is rotatably plugged into the side of the housing 227 and connected to the third gear 231. A second rack 232 is slidably mounted inside the housing 227, with the third gear 231 meshing with the second rack 232. A first airbag 233 is also mounted inside the housing 227, with both ends of the first airbag 233 fixedly connected to the second rack 232 and the inner wall of the housing 227, respectively.

[0053] See Figure 5 and Figure 7 The support rod 190 is set to an "L" shape, and the lower end of the support rod 190 is slidably inserted into the side of the mounting plate 150. A second airbag 234 is provided on the inner side of the mounting plate 150. The first airbag 233 and the second airbag 234 are both filled with air. The upper end of the second airbag 234 is fixedly connected to the inner wall of the mounting plate 150, and the lower end of the second airbag 234 is fixedly connected to the support rod 190. An air pipe 235 is connected between the first airbag 233 and the second airbag 234. The air pipe 235 is set to a high-temperature resistant bellows or hose, so that when the mounting plate 150 drives the support rod 190 and the welding gun 200 to rotate, the air pipe 235 can bend, thereby avoiding the air pipe 235 from hindering the rotation of the mounting plate 150.

[0054] In this embodiment: the second motor 228 drives the third gear 231 to rotate, and through the engagement of the third gear 231 with the second rack 232, drives the second rack 232 to compress the first airbag 233, so that the gas in the first airbag 233 enters the second airbag 234 through the air pipe 235, causing the second airbag 234 to extend downward, driving the support rod 190 to move downward, so that the support rod 190 drives the welding gun 200 to descend, making it easier to move the welding gun 200 close to the weld position, thereby improving the welding effect.

[0055] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0056] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A welding device for high alloy steel pipe fittings, comprising a welding table (100) and a telescopic member (130) arranged on the side of the welding table (100), characterized in that: A bent pipe and a straight pipe for welding are provided on the upper side of the welding table (100); a first motor (140) is installed at the telescopic end of the telescopic member (130); an output shaft of the first motor (140) is connected to a mounting plate (150); a positioning column (160) is rotatably provided on the side of the mounting plate (150); a positioning piece (170) is movably provided on the side of the positioning column (160); the positioning piece (170) is used to support and position the straight pipe; a clamping piece (180) is provided on the side of the welding table (100) for fixing the bent pipe; a support rod (190) is slidably inserted into the side of the mounting plate (150); a welding gun (200) is provided at the end of the support rod (190); the welding gun (200) moves along the circumference of the weld seam of the bent pipe and the straight pipe; A circular plate (210) is installed at the end of the positioning column (160), a circular ring (211) is concentrically arranged on the side of the circular plate (210), a sliding plate (212) is arranged between the circular plate (210) and the circular ring (211), and the number of the sliding plates (212) is set to be several, and the several sliding plates (212) are equidistantly arranged in the circumferential direction; Riveted rods (220) are installed on both sides of the sliding plate (212); a straight groove (221) for use with the riveted rod (220) is opened on the side of the circular plate (210); an arc groove (222) for use with the riveted rod (220) is opened on the side of the ring (211); the riveted rods (220) on both sides of the sliding plate (212) are slidably inserted into the straight groove (221) and the arc groove (222) respectively; a limiting slide is also installed on the side of the sliding plate (212) close to the circular plate (210); a limiting slide groove (224) for use with the limiting slide is opened on the side of the circular plate (210); the limiting slide is slidably inserted into the limiting slide groove (224); The ends of the sliding plate (212) are both installed with straight rods (225), and the straight rods (225) are located outside the circular plate (210) and the circular ring (211). The positioning pieces (170) are both installed at both ends of the straight rods (225), and the sides of the positioning pieces (170) close to the telescopic member (130) are connected with convex strips (226). A straight tube is sleeved outside the positioning piece (170) close to the telescopic member (130), and the side wall of the straight tube end contacts the convex strip (226); A housing (227) is installed on the outside of the positioning column (160), and a second motor (228) is installed on the outside of the housing (227). The second motor (228) is configured as a double-headed motor. A second gear (229) is installed on the output shaft of the second motor (228) near one end of the ring (211). A tooth groove (230) is provided on the inner ring of the ring (211), and the second gear (229) is engaged with the tooth groove (230).

2. The welding equipment for high alloy steel pipe fittings according to claim 1, characterized in that: A screw rod (181) is rotatably provided inside the welding table (100), and a threaded sleeve (182) is threadedly connected to the outside of the screw rod (181). The number of the threaded sleeves (182) is set to two, and the screw rod (181) is set to a bidirectional screw rod, and the two threaded sleeves (182) are respectively provided on the opposite threads of the screw rod (181).

3. The welding equipment for high alloy steel pipe fittings according to claim 2, characterized in that: The number of the clamping pieces (180) is also set to two, the two clamping pieces (180) are respectively connected to the two wire sleeves (182), the clamping pieces (180) are both set to circular arc pieces, and the two clamping pieces (180) are both slidably set on the upper side of the welding table (100).

4. The welding equipment for high alloy steel pipe fittings according to claim 3, characterized in that: The end of the screw rod (181) is sleeved with a first gear (183), and a first rack (184) is slidably provided on the inner side of the welding table (100), and the first rack (184) is engaged with the first gear (183). The telescopic end of the telescopic member (130) is also installed with a connecting rod (185), and the connecting rod (185) is set in an "L" shape. The lower end of the connecting rod (185) is slidably inserted into the side of the welding table (100), and the end of the connecting rod (185) located on the inner side of the welding table (100) is connected to the first rack (184).

5. The welding equipment for high alloy steel pipe fittings according to claim 1, characterized in that: A third gear (231) is provided on the inner side of the housing (227), and the output shaft of the other end of the second motor (228) is rotatably plugged into the side of the housing (227). The third gear (231) is transmission-connected to the output shaft of the other end of the second motor (228). A second rack (232) is slidingly provided on the inner side of the housing (227), and the third gear (231) is meshed with the second rack (232). A first airbag (233) is also provided inside the housing (227), and the two ends of the first airbag (233) are respectively connected to the second rack (232) and the inner wall of the housing (227).

6. The welding equipment for high alloy steel pipe fittings according to claim 5, characterized in that: The support rod (190) is configured to be L-shaped, and the lower end of the support rod (190) is slidably inserted into the side of the mounting plate (150). A second airbag (234) is provided on the inner side of the mounting plate (150), the upper end of the second airbag (234) is connected to the inner wall of the mounting plate (150), and the lower end of the second airbag (234) is connected to the support rod (190). An air pipe (235) is connected between the first airbag (233) and the second airbag (234), and the air pipe (235) is configured to be a bellows.

7. A welding process for high alloy steel pipe fittings, using the welding equipment for high alloy steel pipe fittings according to any one of claims 1 to 6, characterized in that: The specific steps include: S1. Positioning the bent pipe and the straight pipe: The straight pipe is placed on the positioning piece (170) on the side close to the telescopic member (130), the straight pipe is driven close to the bent pipe by the telescopic member (130), and the bent pipe is clamped and fixed by the clamping piece (180); S2. Aligning the welding surface of the bent pipe and the welding surface of the straight pipe: by expanding the positioning piece (170) outward, the straight pipe is driven to move on the vertical plane so that the center of the straight pipe and the center of the bent pipe are located on the same horizontal line, thereby making the welding surface of the straight pipe overlap and align with the welding surface of the bent pipe; S3. Welding of the bent pipe and the straight pipe: the welding gun (200) rotates one circle along the weld seam between the bent pipe and the straight pipe, thereby completing the welding.

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