转向架用钢激光-MAG复合焊角焊缝

高速列车耐候钢转向架焊接中,有大量角接形式的焊接接头。作为列车的主要承载部件,转向架的焊接要求完全焊透。采用传统MAG焊和激光-MAG复合焊对12 mm板厚的SMA490BW耐候钢进行焊接试验,并观察测试两种方法获得的接头宏观形貌、微观组织和力学性能。结果表明,激光-MAG复合焊接接头组织和力学性能均优于MAG焊接接头,因而在转向架焊接中可替代MAG焊接工艺。

Research on fillet in laser-MAG hybrid welding of SMA490BW weathering steel for bogie

There are numerous comer joints in the welding of weathering steel for bogies in express train.As the main bearing parts of a train,a complete penetration is demanded when welding bogie.In this paper,12 mm thickness SMA490BW weathering steel is respectively tested with MAG welding and Laser-MAG hybrid welding to compare the macro-morphology;microstructure and mechanical properties of the comer joints obtained from these two welding methods.The results show that the laser-MAG hybrid welding joints have ideal microstructures and excellent mechanical properties in contrast with MAG welding;therefore,laser-MAG hybrid welding can replace MAG welding for bogie.