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在厚壁压力容器的接管锻件与筒体的组合焊缝焊接时,经常焊角处产生焊接裂纹,且不断向接管锻件扩展,通过进行化学成分分析及力学性能试验,发现接管锻件材20MnMoNb,20MnMoNb高合金高强钢,且没有进行热处理,组织为马氏体,因此造成所有容器都不合格,如果整体报废损失很大,因此对所有接管进行更换,特制定返修方案,按焊接工艺要求施焊接管锻件与筒体的组合焊缝,一次探伤合格。
In the welding of thick-walled pressure vessel, the welded joint of forgings and cylinder was welded, the welding cracks often occurred at the welding corner and the joints were continuously expanded. By chemical composition analysis and mechanical property test, it was found that 20MnMoNb and 20MnMoNb High-alloy high-strength steel, and without heat treatment, the organization of martensite, resulting in all containers are not qualified, if the overall loss of a large loss, so all take over replacement, special rework program, according to the requirements of welding process welding pipe Forgings and cylinder combination of weld, a test of qualified.