ANS500超级钢板焊接接头的低温韧性

利用熔化极气体保护焊工艺对500MPa级的ANS500超级钢板进行焊接.采用系列冲击试验对接头低温韧性进行了研究.测定了一系列低温韧性值,确定了其正常使用的温度范围.用能量法并辅助断口形貌观察确定了两种焊接工艺下接头韧脆转变温度(DBTT).用1.0mm焊丝焊接时,接头各部位的韧脆转变温度分别为焊缝-65℃,熔合线-70℃,热影响区(HAZ)低于-70℃,焊板安全使用温度为-65℃以上;用0.8mm焊丝焊接时,接头各部位的韧脆转变均在-70℃以下发生,其安全使用温度为-70℃以上.

Low Temperature Toughness of Weld Joint of ANS500 Super Steel Strip

The 6 mm-thick ANS500 super steel strip was welded by gas metal arc welding. A series of Charpy impact tests were done to investigate low-temperature toughness of its weld joints, and the values of toughness were measured at different temperatures to make sure of some temperature ranges that normally correspond to different toughness values. The ductility-brittle transition temperature (DBTT) of different positions of a weld joint was determined by means of impact energy and fracture morphology. When using φ1.0 mm welding wires at 160 A/22 V, The DBTT of weld metal, weld bond and HAZ were measured to be -65°C, -70°C and &le-70°C, respectively, with an safe operating temperature above -65°C. When using φ0.8 mm welding wires at 110 A/21 V, the DBTT of weld metal, weld bond, HAZ were all below -70°C, with a safe operating temperature above -70°C.