Gap filling method for composite elbow and wear-resistant composite elbow

Abstract

The invention relates to a crack filling method of a compound bent pipe and the abrasion-resistant compound bent pipe, and belongs to the technical field of machining. The crack filling method of the compound bent pipe and the abrasion-resistant compound bent pipe resolve the problems that an interval exists between a lining and an outer shell in an existing abrasion-resistant compound bent pipe, so that in the use process, more than 90 percent of compound bent pipes will crack and can not be used any longer. The crack filling method is characterized in that (1) the lining and the outer shell are combined in a sleeved mode, and an injection hole is drilled in the outer shell; (2) two flanges are adopted and respectively comprise a flange inner ring and a flange outer ring, and after each flange inner ring and the corresponding flange outer ring are combined in a sleeved mode, the outer ends are welded into a whole; (3) the outer shell is welded to the flange outer rings, the lining and the flange inner rings are in clearance fit to form an assembly interval crack; (4) paste is injected from the injection hole through an injection gun to fill the interval between the lining and the outer shell; (5) after the paste is cured, plug welding is carried out on the injection hole. The crack filling method of the compound bent pipe has the advantage that the high chromium cast iron compound bent pipe is not prone to cracking when subjected to an impact load, and is mainly used for manufacturing the abrasion-resistant compound bent pipe.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a gap filling method of a composite elbow and a wear-resistant composite elbow made by the method. Background technique [0002] At present, the engineering and construction industry mostly uses wear-resistant composite elbows with high chromium cast iron lining and low carbon steel shell. However, no matter how they are assembled, there is always a gap between the inner liner and the shell due to the need to put the two elbows together. High chromium cast iron is a brittle material that requires a tough material such as a mild steel shell to support it. But the gaps make the high chromium cast iron unsupported and thus shatter when subjected to impact loads. If the gap between the inner liner and the outer shell is not filled or filled unevenly, more than 90% of the composite elbows will be broken during use and cannot be used. Not only cause a lot o...

AI Technical Summary

Problems solved by technology

If the gap between the inner liner and the outer shell is not filled or filled unevenly, more than 90% of the composite elbows will be broken during use and cannot be used

It not only causes a lot of waste, but also delays the precious time of engineering construction

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