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焊接是石油化工低温钢压力容器制造的重要工序,随着石油化工装置规模不断扩大,对低温钢压力容器的焊接质量和焊接效率提出了越来越高的要求。气保药芯焊接材料因其高质量、高效率、易于同母材匹配等优点而应用广泛,但在低温钢压力容器制造领域还应用较少。以典型的HOBART XL550气保药芯焊丝为例,根据低温钢压力容器制造的焊接要求,进行了熔敷金属扩散氢检测试验、焊丝吸潮性试验、热处理性能测试、CTOD测试。测试结果表明:XL550气保药芯焊丝最高扩散氢含量均小于4m L/100g熔敷金属,满足低氢焊接要求;焊态和热处理状态下的强度、硬度和冲击韧性也均满足压力容器的焊接要求;具有良好的止裂性能。在性能测试的基础上进行的现场对接焊试验结果表明,XL550气保药芯焊丝满足低温钢压力容器低氢焊接和热处理前后机械性能稳定的要求。
Welding is an important process for the manufacture of petrochemical low temperature steel pressure vessels. With the continuous expansion of petrochemical plants, higher and higher requirements are placed on the welding quality and welding efficiency of low temperature steel pressure vessels. Because of its advantages of high quality, high efficiency and easy matching with base metal, gas-core flux-cored welding materials are widely used, but less used in the field of low-temperature steel pressure vessel manufacturing. Taking a typical HOBART XL550 gas-cored wire as an example, according to the welding requirements of low-temperature steel pressure vessel, hydrogen diffusion test, wire moisture absorption test, heat treatment performance test and CTOD test were carried out. The test results show that the maximum diffusion hydrogen content of XL550 gas-cored wire is less than 4m L / 100g deposited metal, which meets the requirements of low-hydrogen welding. The strength, hardness and impact toughness under both welding and heat treatment conditions also meet the requirements of pressure vessel welding Requirements; Good anti-cracking performance. The field butt welding test results based on the performance tests show that the XL550 gas-cored welding wire meets the requirements of low-hydrogen welding of low-temperature steel pressure vessels and stable mechanical properties before and after heat treatment.