基于机器人的泵头体焊接修复

Robot-based Welding Repair of Pump Head

研究了泵头体材料30CrNi3MoV钢的焊接性,采用机器人焊接代替传统的手工电弧焊对泵头体进行焊接修复。焊接时,选用1.2 mm的JM-130焊条,焊前预热100℃,焊接电流270～280 A,焊接电压27～29 V,焊接速度75 cm/min,气体流量20 L/min。虽然30CrNi3MoV钢冷裂倾向较大,但是由于采用混合气体保护,在焊接过程中严格控制预热温度和焊缝的层间温度,所以焊后并未发现裂纹,焊接质量良好。富氩气体保护焊工艺的确定为以后同材质材料提供了直接依据,对其他材质泵头体采用气体保护焊修复具有借鉴意义。

The weldability of pump head material, namely 30CrNi3MoV steel, was studied. Robot welding was used to replace traditional manual arc welding to conduct the welding repair of pump head. The 1.2 mm JM - 130 electrode was used to conduct the repair. The 100 ~C preheating was carried out before welding. The welding electric current was between 270 A and 280 A ; the welding voltage was between 27 V and 29 V ; the welding velocity was 75 cm/min; the gas flowrate was 20 L/rain. The 30CrNi3MoV steel has a remarkable tendency of cold crack. Therefore mixed gas was adopted for protection, and strict control of preheating temperature and weld inter- layer temperature was carried out in the process of welding. Thus no crack occurred after welding and the welding quality was desirable. The adoption of argon-rich gas protection welding technology provides the direct basis for the welding of the material of the same quality. It also serves as a reference for adoption of gas protection welding to pump head of other materials.