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Transient Liquid Phase Bonding of High Strength Low Alloy Steel Coiled Tubing

机译：高强度低合金钢螺旋管的瞬态液相键合

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摘要

The oil and gas industry of Alberta, Canada use coiled tubing made from high strength low alloyed steel (HSLA) to extract oil from reservoirs deep beneath the earth's surface. The repeated use of the coiled tubing in down-hole wells results in fatigue failure of the tube material. In order to repair the coiled tube, a section of tubing is fusion welded using tungsten inert gas welding onto the remaining tube steel. However, the fusion weld often fails within the weld region and therefore, alternative joining methods need to be explored to minimize detrimental changes at the joint region. In this study transient liquid phase (TLP) bonding is used with the aid of metal interlayers based on the Ag-Cu and Ni-P systems. These interlayers form a liquid at the melting point and the gradual diffusion of alloying elements into the joint and the diffusion of elements out of the joint region induces isothermal solidification whilst the joint is held at the bonding temperature. The TLP bonding behaviour of the HSLA steel as a function of bonding parameters was investigated and the quality of the joint region determined using metallurgical techniques (light and scanning electron microscopy, energy dispersive spectroscopy) and mechanical testing.
机译：加拿大阿尔伯塔省的石油和天然气工业使用由高强度低合金钢（HSLA）制成的连续油管从地表深处的储层中提取石油。在井下井中重复使用连续油管会导致管材疲劳失效。为了修复盘管，使用钨极惰性气体保护焊将一段管材熔焊到剩余的管钢上。但是，熔焊通常在焊接区域内失效，因此，需要探索替代的连接方法，以最大程度地减少接合区域的有害变化。在这项研究中，借助基于Ag-Cu和Ni-P系统的金属夹层，使用了瞬态液相（TLP）键。这些中间层在熔点形成液体，合金元素逐渐扩散到接头中，元素从接头区域的扩散引起等温凝固，同时接头保持在粘结温度下。研究了HSLA钢的TLP粘结行为随粘结参数的变化，并使用冶金技术（光学和扫描电子显微镜，能量色散谱）和机械测试确定了接头区域的质量。

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