Due to the rapidly growing requirement for high-pressure heave-wall pipeline installation, mechanized GMAW process is a key technology for increase welding productivity.
由于高压厚壁油气长输管线建设的迫切需求，采用自动GMAW焊是提高管线建设生产率的关键。
In order to improve conventional GMAW process the effect of shielding gas quality and mixed ratio of different gases on welding quality are studied and useful fixtures are developed.
为提高常规气电焊工艺水平，进行了保护气体质量及配比对焊缝质量影响规律的研究及气电焊辅具的研制。
The welding method used was a PC-GMAW process with mixture gases shielding. Central crack for the welded plate was located in the fusion zone between welding seam and heat-affected zone.
焊接方法为脉冲熔化极混合气体保护焊，焊接板的中心裂纹处于焊缝与热影响区之间的熔合区。
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