Preheating boiler outer cylinder welding repair method

Abstract

The invention relates to the technical field of boiler welding repair, in particular to a preheating boiler outer cylinder welding repair method. The preheating boiler outer cylinder welding repair method comprises the following steps of determining the position of a defect, cleaning the periphery of the defect, determining a repair welding area according to the shape and size of the defect, and marking the repair welding area; heating the marked area, wherein the size of the heating area is 10-15mm from the repair welding area as the center; knocking the marking area in a red hot state to enable the marking area to be concave on the surface of the cylinder body; according to the size of the sunken area, embedding the corresponding repair plate into the sunken area, and welding the repair plate into the sunken area; smoothing the weld joint; and carrying out flaw detection on a weld zone of the boiler outer cylinder, and carrying out a hydrostatic test after flaw detection. The method solves the problems that in the prior art, when corrosion spots of the boiler outer cylinder are welded and repaired, repair plates are directly added for welding, consequences such as welding leakage, poor welding and weld penetration at the welding position are likely to be caused, and even larger defects are caused, the welding effect is good, and the efficiency is high.

Description

technical field

[0001] The invention relates to the technical field of boiler welding repair, in particular to a welding repair method for preheating an outer cylinder of a boiler. Background technique

[0002] The preheating boiler is a part of an internal combustion vehicle. It is used under high temperature conditions for a long time. Corrosion of the inner wall often occurs, causing pressure test leakage and making it unusable. Welding repairs to the outer cylinder of the boiler are required.

[0003] The traditional welding repair method is to dig out the base metal of the corrosion point and then insert a repair plate of the same size and material for welding, but for the corrosion point, some corrosion points and adjacent local wall thicknesses are very thin and difficult to weld from the outside of the cylinder. It is observed that, for example, the original 2.5mm wall thickness of the cylinder, under the action of corrosion, the local wall thickness of some parts is...

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