用低合金钢焊条焊接高强钢时,为得到高质量的焊接接头,推荐采用能保证熔敷金属中含氢量为1.5厘米~2/100克的焊条。在一般的情况下,氢扩散到能引起冷裂纹的热影响区中。众所周知,氢在焊接接头中的扩散深度:勾1.2～1.5毫米。因此,在高强钢上预先熔敷一层厚度大于1.5毫米的无冷裂纹倾向的低碳 When welding high-strength steel with low-alloy steel welding rod, it is recommended to use a welding rod with a hydrogen content of 1.5 cm -2 / 100 g in order to obtain a high-quality welded joint. In general, hydrogen diffuses into the heat-affected zone, which can cause cold cracking. As we all know, hydrogen diffusion depth in the welded joints: Hook 1.2 ~ 1.5 mm. Therefore, in the high-strength steel pre-fused with a thickness of more than 1.5 mm cold-free tendency of low carbon