| Stainless steel is an important engineering material, which was widely used in different kinds of industrial and environment structure. Tungsten argon arc welding (TIG) is a commonly used welding method for stainless steel. However, because of its low penetration of single pass welding, for medium-thick plate welding, this process require groove, multi-layer and multi-pass welding. Therefore, its welding efficiency is very low, its process is complex and its welding cost increased. Using active argon arc welding (A-TIG),which can achieve full penetration of medium thickness plate one time without groove, can greatly improve the production efficiency and save cost.This article selected 13 kinds of common oxides and fluorides as raw activating fluxes materials for experiment. The effect of each single activating flux on weld penetration, weld width and weld forming was analyzed.6 kinds of good activating fluxes were chosen as basic component for the multi-component formulation. Finally, a good stainless steel activating flux was developed by formula uniform design and optimization design methods. Using this activating flux to weld, the weld penetration achieved more than 3 times of conventional TIG welding. Using orthogonal experiment method to study the effect of welding parameters on weld penetration, weld width and weld forming. A set of optimal welding process parameters was achieved, which made a good weld forming, no undercut et al defects.The activating flux which developed in this article has been taken to welding experiment on stainless steel. Its effect on structure, chemical composition, hardness, tensile properties, bending properties and intergranular corrosion properties has been analyzed. Results show that using this activating flux can greatly improve the production efficiency and the various aspects performance of the welding joint accords with production requirement. It has a broad application prospect and practical value. |
PDF Full Text Request