Method for repairing ship cylinder end through TIG welding

Abstract

The invention discloses a method for repairing a ship cylinder end through TIG welding. The method comprises the following steps that (1) a welding material is manufactured according to one of following methods, specifically, a body piston ring corresponding to a welded workpiece is selected and cut into small pieces as required to be used as the welding material after being degreased through a metal cleaning agent, or a casting iron welding rod CHC408 is selected, a coating is removed, and a flux core is used as the welding material; (2) the surface of the welded workpiece is treated, specifically, a to-be-repaired welded workpiece is detected, a welding repair position is determined, the welded workpiece is subjected to ultrasonic cleaning, the to-be-welded position is cleaned through grinding, new parent metal is exposed, and welding repair is instantly conducted after drying; and (3) welding repair is conducted, specifically, a TIG direct current welding method is selected, argon shielded welding parallel welding is adopted, and leftward welding is conducted. Through the method, welding is easy, the welding yield is high, fusion degree is high, the reuse rate of the cylinder end can be increased, and capital and time for recast are reduced.

Description

technical field [0001] The invention relates to the technical field of welding repair, in particular to a method for repairing a ship's cylinder head by TIG welding. Background technique [0002] Cast iron is an iron-carbon alloy containing more than 2% carbon. Because cast iron has excellent wear resistance, shock absorption, castability and machinability, cast iron parts are widely used in various equipment components of ships. The main engine is the heart of the ship, and the main engine cylinder head and generator cylinder head are the main sources of ship manufacturing power, so the cylinder head is an important heart component in the ship. During long-term use, it is inevitable that the cylinder head will be worn or damaged, especially the cylinder head of the ship's main engine, the cylinder head of the generator and the piston head, which are components that burn at high temperature all day long. [0003] However, when the cylinder head is worn and corroded or othe...

AI Technical Summary

Problems solved by technology

[0005] (1) It is difficult to fuse and weld;

[0006] (2) The internal quality of the weld is poor, and it is easy to produce pores, slag inclusions, and poor fusion force;

[0007] (3) The forming is poor, the welding layers are loose, the arc starting and closing are easy to produce air holes, and the weld joints are prone to welding warts or poor joints;

[0008] (4) Welding repairs of important components, such as welding repairs in small parts, cast iron electrodes held by welding tongs, are easy to collide with components to produce sparks that damage the intact components