CN-121988840-A - Titanium alloy MIG welding method

CN121988840ACN 121988840 ACN121988840 ACN 121988840ACN-121988840-A

Abstract

A titanium alloy MIG welding method includes thoroughly removing pollutants at a welding line by acetone before T-shaped structural members are assembled, assembling and positioning welding, placing the T-shaped structural members on a tooling copper gasket, compacting a workpiece, water-cooling the copper gasket, adjusting welding parameters according to the thickness of a web plate and a cover plate of the T-shaped structural members to ensure that the welding quality and the oxidation degree of the surface of the welding line meet the requirements, performing MIG automatic welding, naturally cooling to room temperature after the welding is completed, loosening a cylinder, and taking down the welded T-shaped structural members. When the welding trolley is used for welding the TA5 marine titanium alloy T-shaped structural member, the silvery white titanium alloy welding seam can be obtained without a drag cover and back protection, the quality standard of the welding seam can be achieved, meanwhile, the welding deformation can be well controlled, the subsequent mechanical correction is not needed, the auxiliary material and the power loss are reduced, and the labor is saved.

Inventors

LI CHAO
LIU ZUODONG
LI XIAODONG
XIE XINYU
ZHANG LIGUO
SUI GUOHONG
ZHOU ZHENGQUAN

Assignees

大连中车大齐集装箱有限公司

Dates

Publication Date: 20260508
Application Date: 20251231

Claims (3)

1. A titanium alloy MIG welding method is characterized by comprising the following steps: S1, before assembling the T-shaped structural member, thoroughly removing pollutants at a welding seam by using acetone, assembling and positioning welding, placing the T-shaped structural member on a tooling copper gasket, compacting a workpiece, and water-cooling the copper gasket; S2, according to the thickness of a web plate and a cover plate of the T-shaped structural member, welding parameters are adjusted, welding wire marks TA1, the diameter is 1.2mm, a cooperative pulse mode is set in a welding machine, the pulse frequency is 10-20HZ, the current proportion is 3:1-4:1, the welding current is 130-150A, the voltage is 21V-23V, the welding speed is 600mm/min-650mm/min, the dry extension of the welding wire is 8mm-15mm, the welding gun angle is 75-85 ℃, the gun nozzle height is 10-18 mm, the pre-air supply time is 0.5 seconds-1 second, the arcing current is 80-120%, the shielding gas is 70% Ar and 30% He, the gas flow is 20-25L/min, and the welding quality and the welding seam surface oxidation degree are ensured to meet the requirements; s3, starting an automatic welding trolley at one side according to preset welding parameters, performing MIG automatic welding, and naturally cooling to room temperature after the welding is finished; And S4, starting an automatic welding trolley at the other side according to preset welding parameters, performing MIG automatic welding, naturally cooling to room temperature after the welding is finished, loosening the air cylinder, and taking down the T-shaped structural member after the welding is finished.
2. A titanium alloy MIG welding method according to claim 1, wherein in S1, the contaminants at the weld are thoroughly removed with acetone.
3. The method for MIG welding of titanium alloy according to claim 1, wherein in S1, a workpiece is pressed by a cylinder, and a copper gasket is water-cooled by a water cooler, a water pump and a cooling water pipe.

Description

Titanium alloy MIG welding method Technical Field The invention relates to the technical field of welding, in particular to a titanium alloy MIG welding method. Background Some devices are formed by welding TA5 titanium alloy, and generally, a T-shaped structural member is formed by welding a web plate and a cover plate, wherein the thickness of the web plate is 4mm, 5mm and 6mm, the thickness of the cover plate is 4mm, and the length of a fillet weld is correspondingly long. The method steps generally adopted at present are as follows: The method comprises the steps of (1) assembling a web plate of a T-shaped structural member with a cover plate, (2) installing a protective towing cover on the back surface and the side surface of a welding line by one person, introducing argon, starting welding by an operator in an argon arc welding mode, holding the argon towing cover by the other person, carrying out gas protection along with a welding gun (as shown in figure 1), and (3) after the welding is finished, cooling the welding line and removing the protective towing cover. The existing method has the defects of (1) low production efficiency due to low welding speed (about 200 mm/min) of the titanium alloy argon arc welding, (2) high production cost due to high argon consumption and more labor occupation due to three-face gas protection required by the titanium alloy argon arc welding, and (3) large welding deformation and difficult later correction. Disclosure of Invention The invention aims to provide a titanium alloy MIG welding method for solving the problems in the background art. To achieve the above object, there is provided a titanium alloy MIG welding method including the steps of: S1, before assembling the T-shaped structural member, removing pollutants at a welding line, assembling and positioning welding, placing the T-shaped structural member on a tooling copper gasket, compacting a workpiece, and performing water cooling on the copper gasket; S2, according to the thickness of a web plate and a cover plate of the T-shaped structural member, welding parameters are adjusted, welding wire marks TA1, the diameter is 1.2mm, a cooperative pulse mode is set in a welding machine, the pulse frequency is 10-20HZ, the current proportion is 3:1-4:1, the welding current is 130-150A, the voltage is 21V-23V, the welding speed is 600mm/min-650mm/min, the dry extension of the welding wire is 8mm-15mm, the welding gun angle is 75-85 ℃, the gun nozzle height is 10-18 mm, the pre-air supply time is 0.5 seconds-1 second, the arcing current is 80-120%, the shielding gas is 70% Ar and 30% He, the gas flow is 20-25L/min, and the welding quality and the welding seam surface oxidation degree are ensured to meet the requirements; s3, starting an automatic welding trolley at one side according to preset welding parameters, performing MIG automatic welding, and naturally cooling to room temperature after the welding is finished; And S4, starting an automatic welding trolley at the other side according to preset welding parameters, performing MIG automatic welding, naturally cooling to room temperature after the welding is finished, loosening the air cylinder, and taking down the T-shaped structural member after the welding is finished. As a further improvement of the technical scheme, in S1, the contaminants at the weld joint are thoroughly removed with acetone. As a further improvement of the technical scheme, in S1, a cylinder is adopted to compress a workpiece, and a water cooler, a water pump and a cooling water pipe are adopted to cool the copper gasket. Compared with the prior art, the welding method has the beneficial effects that after the traditional welding mode is adopted, the workpiece is seriously deformed, and mechanical correction is needed. When the welding trolley is used for welding the TA5 marine titanium alloy T-shaped structural member, the silvery white titanium alloy welding seam can be obtained without a drag cover and back protection, the quality standard of the welding seam can be achieved, meanwhile, the welding deformation can be well controlled, the subsequent mechanical correction is not needed, the auxiliary material and the power loss are reduced, and the labor is saved. Drawings FIG. 1 is a schematic diagram of a titanium alloy argon arc welding mode of a prior T-shaped structural member; FIG. 2 is a schematic illustration of a compressed form of the T-shaped structure of the present invention; Fig. 3 shows MIG welding and cooling of the T-shaped structure of the invention. Detailed Description The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without makin