焊接热输入对高强钢焊条焊缝组织和力学性能的影响  

Effect of Heat Input on Weld Microstructure and Mechanical Properties Prepared by High-strength Steel Electrode

作　　者：蔡养川[1] 罗震[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072

出　　处：《焊管》2015年第5期9-12,共4页Welded Pipe and Tube

摘　　要：针对PCr Ni3Mo VA中碳调质钢,研制一种Cr-Ni-Mo-V合金系高强钢焊条。通过观察焊缝金属金相组织、测量焊缝金属抗拉强度和冲击韧性,研究了焊接热输入对研制出的高强钢焊条性能的影响。研究结果表明:焊接电流超过220 A,随焊接电流的增大焊缝金属组织中针状铁素体逐渐减少,且组织晶粒逐渐粗大,力学性能逐渐恶化。综合考虑焊接热输入对焊缝金属性能的影响,选择焊接电流为220 A左右较为合适。Aiming at PCrNi3MoVA medium carbon quenched and tempered steel, a kind of Cr-Ni-Mo-V alloy system high-strength steel electrode was developed. By observing the microstructure of weld metal, measuring tensile strength and impact toughness of weld metal, the effect of welding heat input on the properties of high strength steel welding electrode was studied. The results showed that when the welding current is higher than 220 A, the amount of acicular ferrite gradually reduce, the organization grain gradually enlarge and mechanical properties gradually deteriorate with the increase of welding current. To comprehensively consider the effect of heat input on the weld metal performance, the welding current about 220 A is more appropriate.

关 键 词：焊接 高强钢焊条 焊接热输入 PCrNi3MoVA Cr-Ni-Mo-V合金系 

分 类 号：TG422.1[金属学及工艺—焊接]