weld penetration短语¹⁴⁴⁹⁷²⁺² 基本例句 焊缝熔深,溶透,焊透深度,焊透 However, the increase of weld penetration is not obvious for VPPA welding comparing with AC- TIG welding. 活性剂对镁合金交流氩弧焊焊缝熔深增加的作用大于对镁合金变极性等离子弧焊的； magsci For negative direction hybrid welding, welding stable was further improved, but weld penetration was not increased. 而当激光-电弧复合热源反向焊接时，电弧稳定性较正向焊接进一步增大。 opticsjournal