我厂生产的一种接长钻头是将高速钢麻花钻头与45°钢柄焊接而成。由于这种异种钢接头焊后极易产生淬火组织,因而常在焊缝及热影响区产生冷裂纹。通过对冷裂纹机理的分析,采用奥氐体焊条施焊,不仅避免了冷裂纹,而且不需焊前预热、焊后保温或热处理等工序,取得了满意效果。 I produced a long drill is a high-speed steel twist drill bits and 45 ° steel handle welded together. Because of this dissimilar steel joints easily produce quenched after welding, and thus often produce cold cracks in the weld and heat affected zone. Through the analysis of the cold crack mechanism, the austenitic electrode welding, not only to avoid the cold crack, and without preheating before welding, heat preservation after welding or heat treatment processes, and achieved satisfactory results.