【摘要】 通过平焊位置和仰焊位置的断续焊比较试验、外接保护气断续仰焊试验、断续仰焊和连续仰焊的比较试验对碱性低氢型奥氏体焊条仰焊气孔成因进行了研究,并引入气孔率进行定量分析。结果表明,仰焊气孔主要是由于焊接保护不良引起的氮气孔,采用连弧焊代替常用的断续焊可在很大程度上降低仰焊气孔的产生。更多还原

【Abstract】 The pore cause in overhead position welding of basic low hydrogen type austenitic electrode is studied.The contrastive discontinuous-arc-welding between in flat position and in overhead position are tested.The discontinuous-arc-welding in overhead position with protective atmosphere is tested.The contrastive tests of discontinuous-arc-welding and continuous-arc-welding in overhead position are also made.The pore rate is introduced to study the pore quantitatively.The results indicate that the welding pore in overhead position welding is nitrogen pore.The cause is the protecting effect in the welding process is not good.The welding pores can be reduced evidently by continuous-arc-welding instead of discontinuous-arc-welding in overhead position welding.更多还原