【摘要】 采用超窄间隙(6～8mm)、熔化极混合气体保护、较低焊接线能量、焊炬伸入坡口、单层单道多层填充焊、单面或双面数字化自动焊接技术,焊接了板厚97mm的BHW35低合金热强钢。并依据《JB4708-2000钢制压力容器焊接工艺评定》国家标准,对超窄间隙MAG焊对接接头进行了拉伸、弯曲和冲击试验,显微组织,显微硬度和宏观形貌分析。研究结果表明,接头的焊态冶金质量完全符合国家标准。焊接热影响区宽度小于等于1.8mm,是现有弧焊技术的1/5～1/3;与母材相比,过热区的冲击功仅下降了8.2%,热影响区的塑韧性损伤基本可以忽略,这一技术优势在传统弧焊技术下是很难实现的。更多还原

【Abstract】 The low hot strong alloy steel BHW35 with the thickness of 97 mm can be welded by in ultra narrow gap of 6～8 mm and MIG/MAG welding,with the torch entering into the bevel,and so on..According to the national standard,the stretch,curving and the impulsion test on the joint has been carried out,and the microstructure,the hardness and the macroscopic appearance has been analyzed.The result indicates that it can meet the requirements of the national standard,with the welding HAZ width≤1.8 mm.Compared with the main material,the damage to tenacity in HAZ may probably neglect,which is very preponderant.更多还原