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[例34]窄间隙埋弧焊在发动机曲轴损伤修复中的应用窄间隙焊接是在已有的埋弧焊方法和工艺的基础上,加上特殊的焊丝、保护气、电极向狭窄的坡口内导入技术以及焊缝自动跟踪等特别技术而形成的一种高效、省时、节能的方法。其优势主要表现在:窄间隙埋弧焊通常采用I型或U型窄间隙坡口,坡口间隙在18~30mm,与普通埋弧焊接同样厚板须采用U型或双U型坡口相比,可节省大量填充金属和焊接时间,从而节省焊材约20%~40%,焊接总效率可提高30%~45%,大大减少了焊接成本;由于采用窄间隙坡口,窄间隙埋弧焊能减小焊接应力,焊缝金属中积聚的氧也较少;由于焊接线能量较小,且后续焊道对前焊道有重叠加热作用,因此,焊接接头
[Example 34] Narrow gap submerged arc welding in the engine crankshaft damage repair Narrow gap welding is based on the existing submerged arc welding methods and processes, plus a special wire, shielding gas, electrodes into the narrow groove Import technology and automatic tracking of welding and other special technology and the formation of an efficient, time-saving and energy-saving approach. Its main advantages are as follows: Narrow gap submerged arc welding usually adopts I type or U type narrow gap groove with groove gap of 18-30mm. U-type or double U-type groove phase Saving a large amount of filler metal and welding time, thereby saving about 20% -40% of the welding consumables and increasing the total welding efficiency by 30% -45%, greatly reducing the welding cost; as a result of adopting a narrow gap groove and narrow gap submerged arc Welding can reduce the welding stress, the weld metal in the oxygen accumulation is also less; due to the welding line energy is smaller, and the follow-up weld bead has overlapping heating effect on the front weld, therefore, welded joints