Both wet and dry underwater welding operations are presented to repair the burst at the welding seam of large size crossing steel pipe.

介绍了大口径过河钢管接口焊缝爆漏现象，以及湿法和干法水下焊接修复技术。

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A study was carried out on the microstructure of interface and welding seam in dual-metal clad steel pipe. And its inferences on technological and service properties were studied.

通过金相分析、微区成份分析、宏观和微观断口分析，主要研究钎焊层和焊鏠区的微观结构及其对复合钢管工艺性能和使用性能的影响。

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