摘要
针对62U钢的GMAW焊接方法,采用成分为79%Ar＋21%CO_2的保护气体,利用HS-60NiMo焊丝作为填充材料,选用焊接电流在100~340 A范围内的5种不同的焊接工艺参数进行焊接,并对焊接接头进行了力学性能测试和拉伸断口分析。结果表明,焊接电流在100~340 A范围内,焊接接头拉伸性能能够满足要求,且焊接电流在180~340A之间时,抗拉强度、屈服强度和伸长率等力学性能随焊接电流的增加均呈现先上升后下降的趋势;其中焊接电流在240~300A范围时,接头综合力学性能最好;但焊接电流在100 A时,接头易出现未熔合缺陷,降低了焊接接头的伸长率;焊接电流在100~340 A范围内,拉伸断裂型式为微孔聚集型,断口的韧窝底部存在第二相质点。
62U steel was welded with GMAW method under five kinds of welding process parameters, using shielding gas composition of 79%Ar＋21%CO2, HS-60NiMo welding wire. Then, the mechanical properties of the welded joints were tested, and the tensile fracture was analyzed. The results show that, the tensile properties can meet the requirements of welded joint when the welding current is 100-340 A. In the range of 180-340A of welding cnrrent, the tensile strength, yield strength and elongation mechanical properties increases first and then decreases with the increase of welding current. With the welding current in the range of 240-300 A, the comprehensive mechanical properties of the joint is the best; but when the welding current is 100 A, the joint is easy to generate incomplete fusion defects, which can reduce the rate of extension of welded joint; when the welding current is in the range of 100-340 A, the tensile fracture type is deposit, and the fracture surface dimple bottom has the second phase particle.
出处
《热加工工艺》
CSCD
北大核心
2016年第3期211-212,216,共3页
Hot Working Technology
关键词
62U钢
工艺参数
力学性能
62U steel
process parameters
mechanical properties
