Failure Analysis and Welding Repair for Water Wall Tube Crack of Supercritical Boiler

Xiang Feng Zheng; Yun Jian Jiang; Rong Gang Xue; Nan Wu; Wen Bin Li; Xiao Jun Hao

doi:10.4028/www.scientific.net/AMR.1004-1005.1410

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 1004-1005Failure Analysis and Welding Repair for Water Wall...

Failure Analysis and Welding Repair for Water Wall Tube Crack of Supercritical Boiler

Abstract:

Through methods, such as microscope analysis, mechanical analysis, chemical analysis, metallography examination etc, the causes resulting in water wall tube cracking of the supercritical boiler have been analyzed. The result indicates this water wall tube cracking is the high temperature creep fracture. The higher tensile stress, microstructure aging and high temperature strength degradation are the primarily inducement of cracking failure. In welding tube, the measures of reducing residual stress, such as lower welding heat input, reducing thickness of welding layer, assigning reasonably heat treatment power, lengthening holding time and so on, were taken. The welding repair succeeded greatly.