Micro beam TIG welding was carried out on the edge joint of 0.2 mm 1Cr18Ni9Ti austenitic stainless steel end joint, using two forms of continuous welding and pulse welding. The effects of welding current and welding speed on the weld formation and joint were studied..,Results,2,show that the welding width increases with the increase of welding current, and the depth of penetration also increases. Smaller welding widths and greater depths of penetration can be achieved with pulse welding at the same effective current. The tensile strength of the joint increases first and then decreases with the increase of welding current. The tensile strength of the joint is improved by pulse welding, and the maximum tensile strength of the joint is 1 070 N, higher than 950 N of continuous welding. After welding, more δ ferrite appeared in the base material of austenite grains, which are divided into multiple layers by the fusion line by pulse welding method. The microstructure at the fusion line is the worm or strip δ ferrite distributed on the austenite grains.
QI B J，XU H Y，ZHANG W. Microstructure and property analysis of 0Cr18Ni9Ti joints welded by ultra-sonic pulse tungsten-inert-gas welding technology［J］. Journal of Beijing University of Aeronautics and Astronautics，2009，35（02）：132-136.