高合金钢焊缝根部的“过烧”虽然未被相关焊接规程定义为缺陷,但实际上对焊接管道的使用寿命有极大的影响。通过对其产生机理、形貌特征进行分析,制定了相应的防范方法。通过理论分析和试验、研究论证了采用药芯焊丝和控制根层焊缝温度2种不充氩焊接方法的可行性。 Although the “over-burning” of the root of a high-alloy steel weld is not defined as a defect by the relevant welding procedure, the service life of the welded pipe actually has a great impact. Through the analysis of its production mechanism and topographic features, corresponding preventive measures have been worked out. Through theoretical analysis and experiments, the feasibility of using two kinds of non-argon welding methods of flux-cored wire and root-weld temperature control is demonstrated.