【摘要】 以厚板980钢为对象,进行了超窄间隙熔化极混合气体保护自动对接焊试验,并依据《JB4708-2000钢制压力容器焊接工艺评定》国家标准,对980钢超窄间隙MAG焊接头进行了拉伸、弯曲和冲击试验,分析了显微组织、显微硬度和宏观形貌。结果表明,接头所有技术指标均满足国家标准要求,且焊接热影响区很窄,该区塑韧性损伤极小。更多还原

【Abstract】 Taking the steel 980 thick plate as example,the automatic butt welding experiment of ultra-narrow gap gas metal arc welding was conducted.According to China standard 《JB4708-2000 welding procedure qualification for steel pressure vessels》,the tests of tensile and impact,analysis of microstructure,microhardness and macro-visage of steel 980 ultra-narrow-gap gas metal arc welded joint were conducted.It shows that all technical norms of the welded joint meets the national standard.The HAZ is in very narrow width and minimal damage of plasticity and toughness damage.更多还原