钢基体表面TIG铜堆敷层泛铁规律分析

采用HS201铜焊丝在35CrMnSiA钢基体表面进行TIG堆焊工艺试验,研究了堆覆层泛铁量的变化,分析了界面层微观组织,对铜堆敷层中泛铁的分布、形态的发展演变以及泛铁量规律进行了较为系统的研究.结果表明,随着堆焊电流的增大,堆敷层内溶解的铁逐渐增多,其形态也逐渐改变;在堆焊电流小于270 A时堆敷层内无明显泛铁,泛铁形态为微小的颗粒状或类树枝状;焊接电流超过300 A时,铜堆敷层中泛铁形态发生较大变化,堆敷层中出现大块球状泛铁;同时在电弧力的作用下,液态铜与液态铁机械混合在一起,凝固形成铜与铁相互包含的泛铁形态.

Content of Fe in TIG cladding copper alloy layer on surface of steel

TIG cladding was carried out on the surface of 35CrMnSiA steel using HS201 welding wire.The content of Fe in the cladding layer and the microstructure of the interface between copper layer and base metal were analyzed.The evolvement and development of the distribution and the shape of the Fe in the cladding layer was investigated sy stemically.The results show that with the increased welding current, the content of Fe is increased and the shape is transformed qreatly.The shape of Fe is granular and treeing-like in the cladding layerwith the welding current below 270A;the shape of Fe is changed strongly and the large spherical Fe particle appears in the cladding layerwith the welding current surpassing 300 A.Under the effect of the arc force, the liquid Cu and Fe is mechanically mixed and the configuration of the solidified microstructure is the inclusion of Cu and Fe.