焊接极性对水下高压干法GMAW影响分析
Effect of welding polar on dry hyperbaric GMAW process
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摘要: 通过环境压力为0.1~2.0 MPa的水下高压干法熔化极气体保护焊(GMAW)试验,比较了直流反接与直流正接焊接过程特点.结果表明,直流反接时,当压力超过0.2 MPa后开始出现少量飞溅,随着环境压力增加,飞溅数量逐渐增多而尺寸逐渐减小.直流正接时,当环境压力大于0.4 MPa后,焊接过程稳定,几乎无飞溅产生.通过高速摄像分析总结了直流反接产生两种飞溅形式及其特征.熔滴偏离型飞溅是伴随着排斥过渡产生的;熔滴反弹型飞溅是由于熔滴接触母材后受向上方向电磁力作用,脱离母材而产生的,并分析了直流正接时飞溅较小的原因.Abstract: Dry hyperbaric gas metal arc welding(GMAW) experiments with direct current electrode positive(DCEP) and direct current electrode negative(DCEN) were carried out. The process characteristics with different welding polar were studied at ambient pressure 0.1-2.0 MPa. By using DCEP, welding spatters appears when the pressure reached 0.2 MPa. Spatter generation level increases and spatter size decreases with increasing pressure. When ambient pressure is more than 0.4 MPa, welding process of DCEN is stable with nearly no spatter generation. The characteristics of two spatter types in DCEP were analyzed by high speed camera. The droplet deviated spatter is generated in the process of droplet repelled transfer. Another type of droplet rebounded spatter, is generated by the electromagnetic force. The reason of few spatters generating with DCEN was discwssed.
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Keywords:
- dry hyperbaric welding /
- gas metal arc welding /
- weld appearance /
- spatter
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