水下湿法自保护药芯焊丝焊接成型气孔产生机理研究

摘要

By using underwater self-designed wet flux-cored wire and automatic welding system ,we analyze the mechanism of the blowhole formation by comparison the welding formation under different welding parameters . The influences of the parameters on the blowhole formation are studied to determine the optimal margin of the parameters . The results show that within the margin , the macroscopic welding surface is smooth and the welding process is stable .The faster the wire feeding speed (current) ,the more the blowholes .With the increase of voltage ,the dry elongation parameter value will increase but less blowholes are produced .The swing speed of the welding torch may also take the effects on the number of the blow holes .%采用自制水下湿法药芯焊丝以及水下自动焊接系统，通过不同焊接参数下的焊缝成形对比，研究了水下湿法焊接气孔产生的机理。分析了焊接工艺参数对水下湿法焊接气孔产生的影响规律，确定了水下湿法焊接气孔控制的最佳工艺参数范围。结果显示，在焊缝宏观表面成形质量较好以及焊接过程稳定的工艺参数范围内，随着送丝速度（电流）的增加和焊接速度的增加，产生气孔的几率也随之增加；随着电压参数的提高，干伸长参数数值增加，产生气孔的几率减少；焊枪摆动速度参数过大或者过小都会使产生气孔的几率增加。