高强度贝氏体钢板不同焊接方法接头的组织和性能

Joint Microstructure and Properties at Various Welding Method in High Strength Bainitic Steel Plate

利用二氧化碳保护焊、埋弧焊、手工电弧焊研究了高强度贝氏体钢板焊接接头的组织和力学性能。结果表明:二氧化碳保护焊焊后不热处理接头焊缝组织为贝氏体、少量铁素体和珠光体,热影响区为新型贝氏体组织;手工焊焊后不热处理焊缝组织主要为块状铁素体和少量珠光体,热影响区组织为新型贝氏体组织;埋弧焊焊后不热处理焊缝部分组织为针状铁素体,熔合线结合良好,组织分布均匀,晶粒细小,热影响区组织为新型贝氏体。各种焊接方法焊接接头具有良好的强韧性。

The joint microstructure and mechanical properties of high strength bainitic steel plate were studied by CO2 gas shielded welding （CGSW）, submerged arc welding（SAW） and manual arc welding （MAW）. The results show that welding and without heat treatment, the microstructure of CGSW is bainite, a little ferrite and pearlite, there is new type bainitic microstructure in heat-affected zone. The microstructure of weld metal for MAW is blocky ferrite and a little pearlite, the microstructure in the heat-affected zone is new type bainite. The microstructure of weld metal for SAW is acicular ferrite, and there is new type bainitic microstructure in heat-affected zone, grains are well-distributed and good joining in bond area. The weld joint of bainitic steel plate has good strength and toughness after various welding.