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，尤其是接头的几何形状。为提高钢的疲劳强度，进行了TIG修整工作。然而，TIG修整会对焊接接头造成额外的角畸变。因此，需要更小的热量输入。但较小的焊接电流会导致沿焊缝线产生奇怪现象，而脉冲TIG可以在小的热输入处理中防止这种奇怪现象的发生。为明确脉冲参数对脉冲TIG焊接接头疲劳强度的影响，进行了脉冲TIG焊接接头疲劳强度试验。得到的结果如下：1。脉冲TIG敷料具有显著的抗疲劳强度。在较小的热输入下可以使用TIG修整。

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.