Automatic welding method for butt joint of stainless steel pipes

Abstract

The invention discloses an automatic welding method for butt joint of stainless steel pipes. A welding seam of the stainless steel pipes is bottomed by adopting a pulse argon arc welding technology so as to increase the depth of fusion and the controllability of a molten pool, a three-pulse mode of welding current pulse, wire feeding speed pulse and welding gun rotating speed pulse is adopted, the frequency of the wire feeding speed pulse and the frequency of the welding gun rotating speed pulse are matched with the frequency of the welding current pulse, so that heat affected zones are reduced, welding seam forming is optimized, bottoming forming is ensured, direct-current argon arc welding is combined with arc voltage control, filling and capping of butt welding seams are conducted, welding process parameters are set in a non-equal region mode in the whole process, the welding quality of different areas is controlled, the welding seam at least composed of a base layer, a filling layer and a covering layer is formed, and automatic welding of butt joint of the stainless steel pipes is completed through pipe automatic welding tongs. The method overcomes the influence of the size and assembly error of the pipe fitting, improves the stiffness and stability of the electric arc, solves the deformation problem of stainless steel welding, and has the advantages of wide application range, high compatibility and high working efficiency.

Description

technical field [0001] The invention relates to the production and manufacture of stainless steel pipes for marine low-speed diesel engines, in particular to an automatic welding method for butt joint of stainless steel pipes, which belongs to the technical field of welding. Background technique [0002] With the upgrading of marine low-speed diesel engines and the application of new technologies, the proportion of stainless steel pipe production in the production process of marine low-speed diesel engines is increasing, and the original manual TIG welding method can no longer meet the production requirements. Moreover, the dimensional error of the stainless steel pipe fitting itself and the accuracy of the assembly process will affect the welding quality of the stainless steel pipe; especially for the conventional automatic welding method, these errors may directly lead to the failure of the welding forming, so the ordinary automatic welding method cannot It is suitable for...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of the existing stainless steel pipe butt welding process and provide an automatic welding method for stainless steel pipe butt welding. The butt welding of stainless steel pipes is completed by using automatic welding tongs for pipes and pipes, forming a bottom layer and a filling layer. To overcome the influence of dimensional errors and poor assembly accuracy of pipe fittings, pulse argon arc welding technology is used to ensure the bottom forming, reduce the heat-affected zone, optimize the weld shape, and ensure the welding efficiency and weld shape. Consistency, effectively solve the problem of large deformation of stainless steel welding, achieve the effect of wide application range, good compatibility and high work efficiency

Images