The use of pulsed gas metal arc welding (P-GMAW) is fundamental to applications were versatility and control of heat input are required during deposition. However, when welding using pure argon shielding gas, a drawback is the instability derived from wandering of the cathode spots on the weld pool. This work investigates an alternative to weld steels using pure argon shielding gas with cold wire pulsed gas metal arc welding (CW-P-GMAW). A mechanism for enhanced stability is revealed in CW-P-GMAW, related to the migration of cathode spots to the cold wire which prevents the cathode spots from wandering around the weld pool. The migration of cathode spots is likely related to charging of oxides on the cold wire surface by ions formed in the arc plasma. The enhanced arc stability smooths the shape of bead profile, since wandering of the arc due to cathode motion is suppressed.

脉冲气体保护金属电弧焊 (P-GMAW) 的使用对于在沉积过程中需要多功能性和热输入控制的应用至关重要。然而，当使用纯氩气保护气体进行焊接时，缺点是由于焊池上阴极点的漂移而导致的不稳定性。这项工作研究了使用纯氩气保护气体和冷丝脉冲气体保护金属电弧焊 (CW-P-GMAW) 焊接钢的替代方法。在 CW-P-GMAW 中揭示了一种增强稳定性的机制，这与阴极点向冷焊丝的迁移有关，可防止阴极点在熔池周围游荡。阴极点的迁移可能与电弧等离子体中形成的离子对冷焊丝表面的氧化物充电有关。增强的电弧稳定性使焊道轮廓的形状变得平滑，