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首页> 外文期刊>Transactions of the Indian Institute of Metals >Welding L415/316L Bimetal Composite Pipe Using Post-Internal-Welding Process
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Welding L415/316L Bimetal Composite Pipe Using Post-Internal-Welding Process

机译：使用后焊接过程焊接L415 / 316L双金属复合管

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摘要

The butt welding of bimetal composite pipes generally adopts single-side welding, which easily gives rise to the problems such as high cost or crack initiation. In this paper, the butt welding of L415/316L bimetal mechanical lined pipes was conducted using post-internal-welding process, which is double-side welding process, proposed by the authors. Firstly, the effect of groove shape on the weld process was discussed. Then, microstructures and mechanical and corrosion-resistance properties of welded joints welded using two different welding materials, 309MoL and 309L, were investigated. The results show that the most suitable groove is that L415 is V shape with angle of 60 degrees and blunt edge of 1 mm and 316L is stripped 6-8 mm. The weld of both 309MoL and 309L is composed of austenite and a small amount of ferrite, but the presence of Mo can refine the grains and increase the content of ferrite phase. The width of transition layer is about 0.6-0.8 mm located at the weld junction of stainless steel weld and carbon steel weld, and the transition layer mainly contains martensite. The tensile and bending performances of the welded joints using both 309MoL and 309L do meet the standard requirements. The welding wire 309MoL can improve the corrosion resistance to Cl- compared to 309L. It is advisable to use the post-internal-welding process and 309MoL for the welding of bimetal composite pipes under environments containing Cl-.
机译：双金属复合管的对接焊接通常采用单侧焊接，这容易产生高成本或裂纹诸如诸如高成本或裂纹启动等问题。在本文中，使用内部焊接过程进行了L415 / 316L双金属机械衬里管的对接焊接，这是作者提出的双侧焊接过程。首先，讨论了凹槽形状对焊接过程的影响。然后，研究了使用两种不同焊接材料，309mol和309L焊接的焊接接头的微观结构和机械和耐腐蚀性。结果表明，最合适的凹槽是L415是V形，角度为60度，1mm和316L的钝边6-8mm。 309mol和309L的焊缝由奥氏体和少量铁氧体组成，但MO的存在可以细化晶粒并增加铁氧体相的含量。过渡层的宽度位于不锈钢焊接和碳钢焊接的焊接结处约0.6-0.8mm，过渡层主要含有马氏体。使用309mol和309L的焊接接头的拉伸和弯曲性能符合标准要求。焊丝309mol可以改善与309L相比加入Cl-的耐腐蚀性。建议在含有CL-的环境下使用后内焊接工艺和309mol用于焊接双金属复合管道。

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