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焊接低合金高强钢时,通常采用碱性低氢焊条。钢的强度越高则要求焊缝含氢量越低,才不至于产生氢引起的冷裂纹。所以,焊接强度为60公斤/毫米~2钢的焊条,日美规定其焊缝含氢量在4毫升/100克以下,70公斤/毫米~2以上则要求3毫升/100克以下,而苏联则要求5毫升/100克以下。但是,目前国内生产的低氢焊条其焊缝含氢量较高,要采用较复杂的焊接工艺,才能满足焊接高强钢防止产生冷裂纹的要求。因此,为了进一步提高高强钢的抗裂能力及
Low-alloy high-strength steel welding, usually using alkaline low-hydrogen electrode. The higher the strength of steel requires the lower the hydrogen content of the weld, it will not produce hydrogen-induced cold crack. Therefore, welding strength of 60 kg / mm ~ 2 steel electrodes, Japan and the United States provides that the weld hydrogen content of 4 ml / 100 grams less than 70 kg / mm ~ 2 requires 3 ml / 100 grams or less, while the Soviet Union Requires 5 ml / 100 grams or less. However, the current domestic production of low hydrogen electrode welding seam hydrogen content is higher, to use more complex welding process, to meet the welding of high strength steel to prevent cold cracking requirements. Therefore, in order to further improve the high-strength steel crack resistance and