CN115533315A - A kind of welding method of triangular thin-walled stainless steel pipe - Google Patents

Abstract

The invention discloses a welding method for a triangular thin-walled stainless steel pipe, making a specific welding positioning tool to position the triangular thin-walled stainless steel pipe; performing pre-welding preparation; wiping the surface of the part with alcohol until it is clean, and fixing the parts to be welded with the welding positioning tool On the positioner; set the welding track of the laser welding machine and the corresponding welding process parameters; perform welding according to the set welding track and the corresponding welding process parameters; clean up after welding; check each piece of triangular special-shaped thin-walled stainless steel Fluorescence inspection is carried out for pipe welding, and the surface is to be free of defects such as cracks and pores. The invention uses different powers in different welding sections, effectively avoiding defects such as incomplete fusion, welding penetration, undercut, etc., and welding and positioning triangular thin-walled stainless steel pipes by setting welding positioning tools, which has the characteristics of simple structure.

Description

A kind of welding method of triangular thin-walled stainless steel pipe

technical field

The invention relates to the technical field of steel pipe welding, in particular to a welding method for triangular thin-walled stainless steel pipes.

Background technique

Due to its high rigidity, reasonable force, and high cost performance, the triangular structure is widely used in many machinery manufacturing industries such as aerospace, nuclear power, automobiles, and shipbuilding. The thickness of the triangular thin-walled stainless steel tube is 0.5mm, and it is composed of a head and a rod (Figure 1). Formed by welding. Compared with the traditional welding process, laser welding has the advantages of high automation, fast welding speed, low heat input, small deformation, etc., and has a high degree of compliance with the quality requirements of triangular thin-walled stainless steel pipes.

The existing laser welding technology generally fixes such parts on the rotary tooling, and completes the welding by rotating the parts once while the laser head remains still. Welding under constant laser power, the defocus (the distance from the laser head to the part) needs to be kept constant, the laser head is perpendicular to the welding position, and the welding speed of each section of the triangular thin-walled stainless steel pipe (parallel section and arc section) must be consistent , in order to ensure the uniformity, precision and quality of the continuous weld. Therefore, during the welding process of the existing triangular thin-walled stainless steel pipe, the amount of defocus, the angle of work and the laser head are variable, and the linear speed of each section is inconsistent, and defects such as lack of fusion, welding penetration, and undercut are prone to occur, resulting in poor forming and low strength. .

Contents of the invention

In order to solve the above-mentioned existing triangular thin-walled stainless steel pipes, the defocus amount, the angle of work and the laser head are variable during the welding process, and the linear speeds of each section are inconsistent, and defects such as lack of fusion, welding penetration, and undercut are prone to occur, resulting in poor forming, In order to solve the technical problem of low strength, the present invention provides the following technical solutions:

A kind of triangular thin-walled stainless steel pipe welding method of the present invention comprises the following steps:

Step 1. Make a specific welding positioning tool to position the triangular thin-walled stainless steel pipe;

Step 2. Prepare before welding, use a grinding tool to clean the position to be welded, remove the surface oxide layer and scratches on the worn part, so that it presents a metallic luster;

Step 3. Use alcohol to wipe the surface of the part until it is clean, and fix the part to be welded on the positioner with a welding positioning tool;

Step 4. Set the welding trajectory of the laser welding machine and the corresponding welding process parameters;

Step 5. Perform welding according to the set welding trajectory and corresponding welding process parameters;

Step 6. Clean up after welding, and polish the position after welding to make it appear metallic luster;

Step 7. Fluorescence inspection is carried out on the welding of each triangular special-shaped thin-walled stainless steel pipe piece by piece, and the surface should have no defects such as cracks and pores.

As a preferred technical solution of the present invention, the setting method of the welding process parameters is: welding 2mm from the starting position with laser power 350W ± 20W for preheating; welding 2mm from the starting position with laser power 380W ± 20W, ; Then weld 1 circle at the current position with laser power 430W±20W, and use laser power 430W±20W; finally, reduce the power by 100W for every 1mm of welding, and weld 3mm in total until the welding track extends outside the part.

As a preferred technical solution of the present invention, the welding positioning tool includes a rotating clamping boss, the end of the rotating clamping boss is provided with an anti-collision positioning rod, and the end of the anti-collision positioning rod is provided with a through-hole Rod, the inner end of the piercing rod is provided with a rod triangular positioning platform, the outer end of the penetrating rod is provided with a head triangular positioning platform, and the outer side of the penetrating rod is provided with a lock nut screwed in, A positioning port for positioning the triangular thin-walled stainless steel pipe and the parts to be welded is formed between the rod triangular positioning platform and the head triangular positioning platform.

As a preferred technical solution of the present invention, the triangular positioning platform of the rod part is the same as the internal profile of the rod part of the triangular thin-walled stainless steel pipe, and the triangular positioning platform of the head is the same as the internal profile of the head part of the triangular thin-walled stainless steel pipe.

As a preferred technical solution of the present invention, the setting method of the welding trajectory is to collect interpolation points P1, P2, P3, P4, P5, P5a, P6, P7, P8a, P8, P9, P10, P11, P12, P13, P14, P15, P16, each point is the Cartesian coordinate point of the six-axis robot {X, Y, Z, A, B, C, S, T, E1, E2, E3, E4, E5 ,E6}

Among them, the operation of each section of P1P2, P2P3, ..., P15P16 satisfies the following formula:

XP10.Y=XP1.Y, XP9.Y=XP1.Y, XP8.Y=XP1.Y, XP7.Y=XP1.Y, XP6.Y=XP1.Y, XP5.Y=XP1.Y, XP4.Y Y=XP1.Y, XP2.Y=XP1.Y, XP3.Y=XP1.Y, XP8a.Y=XP1.Y, XP11.Y=XP1.Y, XP12.Y=XP1.Y, XP13.Y= XP1.Y, XP14.Y=XP1.Y, XP15.Y=XP1.Y, XP5a.Y=XP1.Y, XP16.Y=XP1.Y;

XP1.Y=XP1.Y+B*C;

XP2.Y=XP2.Y+B*C;

XP3.Y=XP3.Y+B*C;

XP4.Y=XP4.Y+B*C;

XP5.Y=XP5.Y+B*C;

XP5a.Y=XP5a.Y+B*C;

XP6.Y=XP6.Y+B*C;

XP7.Y=XP7.Y+B*C;

XP8.Y=XP8.Y+B*C;

XP8a.Y=XP8a.Y+B*C;

XP9.Y=XP9.Y+B*C;

XP10.Y=XP10.Y+B*C;

XP11.Y=XP11.Y+B*C;

XP12.Y=XP12.Y+B*C;

XP13.Y=XP13.Y+B*C;

XP14.Y=XP14.Y+B*C;

XP15.Y=XP15.Y+B*C.

As a preferred technical solution of the present invention, the operating speed of the laser head of the laser welding machine is 20mm/s±3mm/s.

As a preferred technical solution of the present invention, the welding speed of the laser welding machine is 15mm/s±2mm/s, the shielding gas is 18L/min±3L/min, the light spot is 2.5mm, and the defocus is 16mm.

The beneficial effects of the present invention are:

This kind of triangular thin-walled stainless steel pipe welding method uses different powers in different welding sections, effectively avoiding the existence of defects such as incomplete fusion, welding penetration, and undercut; and the welding positioning of triangular thin-walled stainless steel pipes is performed by setting welding positioning tools , has the characteristics of simple structure, in which the rotating clamping boss is fixed on the three-jaw chuck before welding. It hinders the space operation of the laser head. The triangular positioning platform of the rod part is the same as the inner profile of the triangular thin-walled stainless steel tube rod, and the triangular positioning platform of the head is the same as the inner profile of the triangular thin-walled stainless steel tube head, so that the parts can be positioned and clamped, and then locked with a lock nut.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is the structural representation of the welding positioning frock of a kind of triangular thin-walled stainless steel pipe welding method of the present invention;

Fig. 2 is the structural representation of the head triangular positioning platform of a kind of triangular thin-walled stainless steel pipe welding method of the present invention;

Fig. 3 is the welding schematic diagram of the triangular thin-walled stainless steel pipe of a kind of triangular thin-walled stainless steel pipe welding method of the present invention and the workpiece to be welded;

Fig. 4 is the welding trajectory schematic diagram of a kind of triangular thin-walled stainless steel pipe welding method of the present invention;

Fig. 5 is a weld effect diagram of a welding method of a triangular thin-walled stainless steel pipe according to the present invention.

In the figure: 1. Rotary clamping boss; 2. Anti-collision positioning rod; 3. Rod penetration; 4. Triangular positioning platform of the rod; 5. Triangular positioning platform of the head; 6. Lock nut; 7. Triangular thin wall Stainless steel pipe; 8. Parts to be welded; 9. Weld seam.

detailed description

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

Embodiment: As shown in Figure 1-5, a kind of triangular thin-walled stainless steel pipe welding method of the present invention comprises the following steps:

Step 1. Make a specific welding positioning tool to position the triangular thin-walled stainless steel pipe;

Step 2. Prepare before welding, use a grinding tool to clean the position to be welded, remove the surface oxide layer and scratches on the worn part, so that it presents a metallic luster;

Step 3. Use alcohol to wipe the surface of the part until it is clean, and fix the part to be welded on the positioner with a welding positioning tool;

Step 4. Set the welding trajectory of the laser welding machine and the corresponding welding process parameters;

Step 5. Perform welding according to the set welding trajectory and corresponding welding process parameters;

Step 6. Clean up after welding, and polish the position after welding to make it appear metallic luster;

Step 7. Fluorescence inspection is carried out on the welding of each triangular special-shaped thin-walled stainless steel pipe piece by piece, and the surface should have no defects such as cracks and pores.

The setting method of the welding process parameters is as follows: welding 2mm from the starting position with laser power 350W±20W for preheating; welding 2mm from the starting position with laser power 380W±20W; and then welding with laser power 430W±20W Position welding for 1 circle, with laser power of 430W±20W; finally, reduce the power by 100W for every 1mm of welding, and weld for a total of 3mm until the welding track extends outside the part. In order to avoid defects such as lack of fusion, weld penetration, and undercut, the laser power needs to use different powers in different welding sections, so as to avoid defects such as lack of fusion, weld penetration, and undercut.

The welding positioning tooling includes a rotating clamping boss 1, the end of the rotating clamping boss 1 is provided with an anti-collision positioning rod 2, and the end of the anti-collision positioning rod 1 is provided with a threading rod 3, and the end of the rotating clamping boss 1 is provided with a threading rod 3. The inner end of the rod 3 is provided with a rod triangular positioning platform 4, the outer end of the penetrating rod 3 is provided with a head triangular positioning platform 5, and the outer side of the penetrating rod 3 is provided with a lock nut 6 screwed in A positioning port for positioning the triangular thin-walled stainless steel pipe and the parts to be welded is formed between the rod triangular positioning platform 4 and the head triangular positioning platform 5 .

Wherein as shown in Figure 5, the triangular thin-walled stainless steel pipe 7 is docked with the workpiece 8 to be welded, and the butt joint schematic diagram of welding the weld 9 is carried out;

The rod triangular positioning platform 4 is the same as the internal profile of the rod of the triangular thin-wall stainless steel pipe, and the head triangular positioning platform 5 is the same as the internal profile of the head of the triangular thin-wall stainless steel pipe. Before welding, fix the rotating clamping boss on the three-jaw chuck. The anti-collision positioning rod can locate the clamping position of the part on the one hand, and on the other hand, the length is longer to prevent the chuck from hindering the space operation of the laser head during laser welding. The triangular positioning platform of the rod part is the same as the inner profile of the triangular thin-walled stainless steel tube rod, and the triangular positioning platform of the head is the same as the inner profile of the triangular thin-walled stainless steel tube head, so that the parts can be positioned and clamped, and then locked with a lock nut.

The method for setting the welding trajectory is to collect interpolation points P1, P2, P3, P4, P5, P5a, P6, P7, P8a, P8, P9, P10, P11, P12, P13, P14, P15, P16, each point is the Cartesian coordinate point of the six-axis robot {X, Y, Z, A, B, C, S, T, E1, E2, E3, E4, E5, E6}

Among them, the operation of each section of P1P2, P2P3, ..., P15P16 satisfies the following formula:

XP10.Y=XP1.Y, XP9.Y=XP1.Y, XP8.Y=XP1.Y, XP7.Y=XP1.Y, XP6.Y=XP1.Y, XP5.Y=XP1.Y, XP4.Y Y=XP1.Y, XP2.Y=XP1.Y, XP3.Y=XP1.Y, XP8a.Y=XP1.Y, XP11.Y=XP1.Y, XP12.Y=XP1.Y, XP13.Y= XP1.Y, XP14.Y=XP1.Y, XP15.Y=XP1.Y, XP5a.Y=XP1.Y, XP16.Y=XP1.Y;

XP1.Y=XP1.Y+B*C;

XP2.Y=XP2.Y+B*C;

XP3.Y=XP3.Y+B*C;

XP4.Y=XP4.Y+B*C;

XP5.Y=XP5.Y+B*C;

XP5a.Y=XP5a.Y+B*C;

XP6.Y=XP6.Y+B*C;

XP7.Y=XP7.Y+B*C;

XP8.Y=XP8.Y+B*C;

XP8a.Y=XP8a.Y+B*C;

XP9.Y=XP9.Y+B*C;

XP10.Y=XP10.Y+B*C;

XP11.Y=XP11.Y+B*C;

XP12.Y=XP12.Y+B*C;

XP13.Y=XP13.Y+B*C;

XP14.Y=XP14.Y+B*C;

XP15.Y=XP15.Y+B*C.

In specific implementation,

Weld interpolation points obtained by the above formula:

XP1 = {x 145.670242, y 1511.52600, Z 519.983276, A 172.057190, B -1.19807792, C -2.14670682, S 22, T 27, E1 89721451, E3 4126382.00, E4 0.0, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4.

XP2 = {x 152.975479, y 1511.52600, Z 519.987915, A 172.057236, B -1.19812477, C -2.14686799, S 22, T 27, E1 89721451, E2 3612849.00, E3 4126382.00, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4

XP3 = {x 159.868820, y 1511.52600, Z 521.966125, A 172.053345, B -2.02217150, C -2.03181624, S 22, T 27, E1 89720764, E2 3613215.00, E3 4126381.00, E4, E4, E4, E4, E4, E4, E4, E4, E4,

XP4 = {x 152.174286, y 1511.52600, Z 520.951233, A 171.591187, B0.231766671, C -2.44283414, S 22, T 27, E1 8987059.25, E34126382.00, E4 0, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4.

XP5 = {x 152.242935, y 1511.52600, Z 520.898926, A 171.168686, B -17.6346054, C 0.277192801, S 22, T 51, E1 8987082.75, E3 4126382.00, E4 0.0, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4.

XP5A＝{X 152.365265,Y 1511.52600,Z 517.885498,A 171.629684,B -0.706039786,C -2.27940321,S 22,T 27,E1 89.9801712,E2 3597138.50,E34126382.00,E4 0.0,E5 0.0,E6 0.0}；

XP6＝{X 152.196243,Y 1511.52600,Z 518.022888,A 167.116409,B26.7088184,C -8.28718090,S 22,T 27,E1 89.9801712,E2 3597194.00,E3 4126382.00,E4 0.0,E5 0.0,E6 0.0}；

XP7 = {x 152.286530, y 1511.52600, Z 517.991150, A 168.482712, B3.31529689, C -3.09454179, S 22, T 27, E1 89.9801712, E2 3597212.75, E3 4126382.00, E4, E4, E4, E4, E4, E4, E4

XP8A = {x 152.381866, Y 1511.52600, Z 517.915466, A 167.621185, B -21.5124321, C 2.16971684, S 22, T 51, E1 89.9801712, E3 4126382.00, E4 0.0, E4, E4

XP8＝{X 152.405334,Y 1511.52600,Z 517.924316,A 167.111923,B -26.5886040,C 3.41249466,S 22,T 51,E1 89.9801712,E2 3597253.00,E3 4126382.00,E4 0.0,E5 0.0,E6 0.0}；

XP9 = {x 152.257690, y 1511.52600, Z 518.091736, A 168.178818, B13.3730650, C -5.18797636, S 22, T 27, E1 89.9801941, E2 3597292.75, E3 4126382.00, E4 0.0, E4, E4, E4, E4, E4, E4, E4,

XP10 = {x 152.313858, y 1511.52600, Z 518.066467, A 168.496872, B0.8529274446, C -2.59244108, S 22, T 27, E2 3597308.25, E34126382.00, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4 0.0, E4.

Xp11 = {x 152.332581, y 1511.52600, Z 518.060242, A 168.479263, B -3.10546517, C -1.78756058, S 22, T 27, E1 89801941, E3 4126382.00, E4 0, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4.

XP12＝{X 154.875336,Y 1511.52600,Z 518.081787,A 168.495224,B -0.820483685,C -2.25186419,S 22,T 27,E1 89.9802094,E2 3613205.75,E34126382.00,E4 0.0,E5 0.0,E6 0.0}；

XP13 = {x 152.239761, Y 1511.52600, Z 518.215088, A 167.749374, B20.0462208, C -6.67124510, S 22, T 27, E1 8987401.75, E3 4126382.00, E4 0.0, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4, E4.

XP14＝{X 154.179092,Y 1511.52600,Z 518.144226,A 168.493820,B -0.543383598,C -2.30742526,S 22,T 27,E1 89.9802094,E2 3611454.50,E34126382.00,E4 0.0,E5 0.0,E6 0.0}；

Xp15 = {x 185.323, y 1511.52600, Z 518.150513, A 168.493439, B -0.543298185, C -2.30754542, S 22, T 27, E1 898802094, E34126382.00, E4 0, E4 0, E4, E4, E4

XP16＝{X 188.954758,Y 1511.52600,Z 518.151550,A 168.493408,B -0.543298662,C -2.30761504,S 22,T 27,E1 89.9802094,E2 3611454.50,E34126382.00,E4 0.0,E5 0.0,E6 0.0}；

The operating speed of the laser head of the laser welding machine is 20mm/s±3mm/s.

The welding speed of the laser welding machine is 15mm/s±2mm/s, the shielding gas is 18L/min±3L/min, the light spot is 2.5mm, and the defocus is 16mm.

Finally, it should be noted that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still understand The technical solutions recorded in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. a kind of triangular thin-walled stainless steel pipe welding method is characterized in that, comprises the following steps: Step 1. Make a specific welding positioning tool to position the triangular thin-walled stainless steel pipe; Step 2. Prepare before welding, use a grinding tool to clean the position to be welded, remove the surface oxide layer and scratches on the worn part, so that it presents a metallic luster; Step 3. Use alcohol to wipe the surface of the part until it is clean, and fix the part to be welded on the positioner with a welding positioning tool; Step 4. Set the welding trajectory of the laser welding machine and the corresponding welding process parameters; Step 5. Perform welding according to the set welding trajectory and corresponding welding process parameters; Step 6. Clean up after welding, and polish the position after welding to make it appear metallic luster; Step 7. Fluorescence inspection is carried out on the welding of each triangular special-shaped thin-walled stainless steel pipe piece by piece, and the surface should have no defects such as cracks and pores. 2. A kind of triangular thin-walled stainless steel pipe welding method according to claim 1, is characterized in that, the setting method of described welding process parameter is, carries out preheating with laser power 350W ± 20W welding 2mm from starting position; Use laser power 380W±20W to weld 2mm from the starting position; then use laser power 430W±20W to weld at the current position for 1 circle, and use laser power 430W±20W; finally reduce the power by 100W for every 1mm of welding, and weld 3mm in total until the welding track Extends outside the part. 3. A method for welding triangular thin-walled stainless steel pipes according to claim 1, characterized in that, said welding positioning tool comprises a rotating clamping boss (1), and the end of the rotating clamping boss (1) An anti-collision positioning rod (2) is provided, and the end of the anti-collision positioning rod (1) is provided with a piercing rod (3), and the inner end of the piercing rod (3) is provided with a rod triangular positioning platform (4) , the outer end of the piercing rod (3) is covered with a head triangular positioning platform (5), and the outer side of the piercing rod (3) is provided with a lock nut (6) screwed in, and the rod A positioning port for positioning the triangular thin-walled stainless steel pipe and the parts to be welded is formed between the triangular positioning platform (4) and the head triangular positioning platform (5). 4. A kind of triangular thin-walled stainless steel pipe welding method according to claim 3, is characterized in that, described rod portion triangular positioning platform (4) is identical with the internal profile of the rod portion of triangular thin-walled stainless steel pipe, and the head The triangular positioning platform (5) is identical with the inside profile of the triangular thin-walled stainless steel pipe head. 5. A kind of triangular thin-walled stainless steel pipe welding method according to claim 1, characterized in that, the setting method of the welding trajectory is to collect interpolation points P1, P2, P3, P4, P5 of the weld seam , P5a, P6, P7, P8a, P8, P9, P10, P11, P12, P13, P14, P15, P16, each point is the Cartesian coordinate point of the six-axis robot {X, Y, Z, A, B, C, S, T, E1, E2, E3, E4, E5, E6} where the operation of each section of P1P2, P2P3, ..., P15P16 satisfies the following formula: XP10.Y=XP1.Y, XP9.Y=XP1.Y, XP8.Y=XP1.Y, XP7.Y=XP1.Y, XP6.Y=XP1.Y, XP5.Y=XP1.Y, XP4.Y Y=XP1.Y, XP2.Y=XP1.Y, XP3.Y=XP1.Y, XP8a.Y=XP1.Y, XP11.Y=XP1.Y, XP12.Y=XP1.Y, XP13.Y= XP1.Y, XP14.Y=XP1.Y, XP15.Y=XP1.Y, XP5a.Y=XP1.Y, XP16.Y=XP1.Y; XP1.Y=XP1.Y+B*C; XP2.Y=XP2.Y+B*C; XP3.Y=XP3.Y+B*C; XP4.Y=XP4.Y+B*C; XP5.Y=XP5.Y+B*C; XP5a.Y=XP5a.Y+B*C; XP6.Y=XP6.Y+B*C; XP7.Y=XP7.Y+B*C; XP8.Y=XP8.Y+B*C; XP8a.Y=XP8a.Y+B*C; XP9.Y=XP9.Y+B*C; XP10.Y=XP10.Y+B*C; XP11.Y=XP11.Y+B*C; XP12.Y=XP12.Y+B*C; XP13.Y=XP13.Y+B*C; XP14.Y=XP14.Y+B*C; XP15.Y=XP15.Y+B*C. 6 . A method for welding triangular thin-walled stainless steel pipes according to claim 1 , wherein the laser head of the laser welding machine runs at a speed of 20mm/s±3mm/s. 7. A kind of triangular thin-walled stainless steel pipe welding method according to claim 1, characterized in that, the welding speed of the laser welding machine is 15mm/s±2mm/s, the shielding gas is 18L/min±3L/min, and the light spot 2.5mm, defocus amount 16mm.

Images