ABSTRACT

The present study deals with a new technique for controlling the weld-induced distortion. This developed technique involves in-situ preheating of welding filler wire before it emerges from the contact tube. Welding filler wire preheating was carried out using an external constant current power source and a specially designed welding torch. Weld beads were deposited on 3.0 mm low carbon steel sheet using a bead on plate technique with different preheat values of welding filler wire by the submerged arc welding process. Electrical signals were recorded to analyze the effect of welding filler wire preheating on arc characteristics. Probability density distribution (PDD) curves from electrical signals indicate that with the rise in preheat value, welding current decreases and results in stable arc characteristics. An increase in preheat value also reduces the longitudinal bending distortion of the sheet. The maximum reduction in the longitudinal bending distortion of the sheet (~53%) was obtained at the maximum preheat value of 200 Ampere.

摘要

本研究涉及一种控制焊接引起的变形的新技术。这种发达的技术包括在焊丝从接触管中出来之前对其进行现场预热。焊接填充焊丝的预热是使用外部恒定电流电源和专门设计的焊炬进行的。使用埋弧焊工艺，通过焊缝法将焊丝沉积在3.0 mm低碳钢板上，焊缝焊丝的预热值不同。记录电信号以分析焊丝预热对电弧特性的影响。电信号的概率密度分布（PDD）曲线表明，随着预热值的增加，焊接电流减小，从而产生稳定的电弧特性。预热值的增加也减少了片材的纵向弯曲变形。在最大预热值为200安培时，板材的纵向弯曲变形最大程度地降低了（〜53％）。