Method for controlling welding deformation of joint between inserted large inclined tube and barrel

Abstract

The invention discloses a method for controlling welding deformation of a joint between an inserted large inclined tube and a barrel. The method comprises the following steps of: 1, forming a hole on the side part of the barrel; 2, assembling the inserted large inclined tube and the barrel, and welding a fixing rib plate on the outer side of the joint; 3, measuring the size of the joint between the barrel and the large inclined tube, and forming an angle alpha for counteracting the distortion allowance; 4, welding a lower welding line; 5, welding a middle lower welding line, measuring an included angle beta with a total station electronic tacheometer, and controlling the included angle beta at 180 degrees in the welding process; 6, welding a middle upper welding line, measuring an included angle beta, and controlling the included angle beta at 180 degrees in the welding process; and 7, welding an upper welding line. In the invention, the total station electronic tacheometer is used together with a rigid fixing method, and the welding deformation of the joint is controlled in the welding process of the inserted large inclined tube and the barrel, so that the product qualified rate is high, and the welding quality is effectively ensured; and the method is simple, and is very effective for controlling the welding deformation of a large inserted joint.

Description

technical field [0001] The invention relates to a deformation control method for welding a plug-in large inclined pipe and a chemical cylinder, and belongs to the field of welding technology. Background technique [0002] At present, in the integrated gasification combined cycle power generation system (Integrated Gasification Combined Cycle, referred to as IGCC), the welded joint structure of the plug-in large inclined pipe 11 and the gas return chamber cylinder 12 is as follows: figure 1 shown. The weld seam of this joint is thick, and the welding workload is extremely huge. In Shangguo's patent "Welding method for joints with non-right angle intersections between plug-in joints and cylinders" (Patent No.: CN200610024861.9), saddle-shaped submerged arc automatic welding and flat welding are adopted. The method of positional and segmental welding welds the large inclined pipe and the cylinder of the gas return chamber, which greatly improves the welding production efficien...

AI Technical Summary

Problems solved by technology

[0003] Due to the large volume of the weld seam and the long welding cycle of the welded joint between the plug-in large inclined pipe and the cylinder of the gas return chamber, and the product structure has high requirements for the dimensional accuracy between the two, how to control the welding joint of this type Transformation is a very big problem

For such large joints, once the welding deformation exceeds the standard requirements, it will be difficult to use effective methods to correct it, and the result will be disastrous

In Shangguo’s patent “Welding method for plug-in joints and non-right-angle intersection joints of the cylinder”, the method of uniformly arranging rigid and fixed ribs on the outer circumference of the cylinder at the root of the weld to prevent welding deformation has achieved certain results. The effect achieved by the method is uncertain

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