摘要
Naval grade high strength low alloy(HSLA) steels can be easily welded by all types of fusion welding processes. However, fusion welding of these steels leads to the problems such as cold cracking, residual stress, distortion and fatigue damage. These problems can be eliminated by solid state welding process such as friction stir welding(FSW). In this investigation, a comparative evaluation of mechanical(tensile, impact,hardness) properties and microstructural features of shielded metal arc(SMA), gas metal arc(GMA) and friction stir welded(FSW) naval grade HSLA steel joints was carried out. It was found that the use of FSW process eliminated the problems related to fusion welding processes and also resulted in the superior mechanical properties compared to GMA and SMA welded joints.
Naval grade high strength low alloy （HSLA） steels can be easily welded by all types of fusion welding processes. However, fusion welding of these steels leads to the problems such as cold cracking, residual stress, distortion and fatigue damage. These problems can be eliminated by solid state welding process such as friction stir welding （FSW）. In this investigation, a comparative evaluation of mechanical （tensile, impact, hardness） properties and microstructural features of shielded metal arc （SMA）, gas metal arc （GMA） and friction stir welded （FSW） naval grade HSLA steel joints was carried out. It was found that the use of FSW process eliminated the problems related to fusion welding processes and also resulted in the superior mechanical properties compared to GMA and SMA welded joints.
基金
The Director,Naval Material Research Laboratory(NMRL),Ambernath for financial support through CARS project No:G8/15250/2011 dated29.02.2012
关键词
低合金高强度钢
焊接工艺
钢接头
组织结构
力学性能
搅拌摩擦焊
机械特性
焊接方法
High strength low alloy steel
Friction stir welding
Shielded metal arc welding
Gas metal arc welding
Tensile properties
Impact toughness
