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水下焊接可分为干法,半干法和湿法。其中,涂药焊条手工电弧焊水下湿法焊接,由于所用设备简单,成本低,操作灵活,能方便地进行各种空间位置和各接头型式的焊接,虽然其接头质量不如干法和半干法,但能满足不少结构的需要,故目前仍被普遍地使用。涂药焊条手工电弧焊水下湿法焊接时,接头的抗拉强度和塑性一般只达到陆上焊接时80%和50%。造成机械性能特别是塑性差的原因主要有两个:一个是接头含氢量高,如铁粉钛型焊条,接头扩散氢量可达50毫升/100克,大大地高于同类型焊条陆上
Underwater welding can be divided into dry, semi-dry and wet. Among them, the coated electrode manual arc welding underwater wet welding, due to the use of equipment is simple, low cost, flexible operation, can be easily carried out a variety of space location and the type of joint welding, although the joint quality as dry and semi-dry Act, but can meet the needs of many structures, it is still widely used. Coated electrode manual arc welding underwater wet welding, joint tensile strength and plasticity generally reach 80% and land welding 50%. There are two main reasons for the poor mechanical properties, especially poor ductility: one is the high hydrogen content of the joint, such as the iron powder titanium electrode, which can diffuse hydrogen up to 50ml / 100g, which is much higher than that of the same electrode