Determination of Pulse Welding Parameter for Improvement of Fatigus Strength

焊接接头的结构对其疲劳强度有一定的影响，尤其是焊趾的几何形状。为了提高疲劳强度，人们通过TIG熔修进行了一些研究。然而，TIG变形会对焊接接头造成额外的角变形，因此需要较小的热输入。但较小的焊接电流可能会出现沿焊缝方向漂移的现象，而脉冲TIG可以在小热输入处理过程中防止这种漂移。本实验研究了脉冲TIG焊接参数对焊接接头疲劳强度的影响。结果表明：1.脉冲TIG焊接具有显著的疲劳强度。2.可以在较小的热输入下进行TIG熔修。

Welded joints may have influence on its fatigue strength by joint configulation,particurally toe geometries.Several works have been done to improve fatigue strength by TIG dressing. However,TIG derssing causes additional angular distortion to welded joints.From this reason smaller heat input is required. But smaller welding current may wondering along weld seam line, and pulse TIG will give a solution to prevent this wondering during a small heat input treatment.This experiment were carried out to clarify the effect of pulse parameters on fatigue strengthy of welded joints by pulse TIG dessing.Obtained results were as follows: 1.Pulse TIG dessing made a remarkable fatiegue strength.2.TIG dressing under a smaller heat input can be used.