Welding repair process for crack of container spreader

Abstract

The invention relates to a welding repair process for a crack of a container spreader. The welding repair process comprises the following steps: the cracked part of the spreader is removed, wherein the length of the removed part of the spreader is required to exceed that of the end of the crack by 50 mm, and an I-shaped groove is formed in the crack removed part of the spreader according to the plating thickness and the jointing form of the spreader; weld passes on two sides of the crack removed part of the spreader within a 150-200 mm area are heated to 200-400 DEG C; a repair welding plate is manufactured, a repair welding rod is placed in the opening of the removed crack for tack welding; manual electric arc welding is adopted with the welding current 1.3 times of the ordinary current, and the welding speed is reduced to 0.8 times of the ordinary speed; after the slow cooling of the welding is finished, the welded surface is polished smoothly by a grinding wheel; and anticorrosive paint is brushed and added again. As preheating is conducted before the welding, and forming at one step is adopted during the welding, the quality of a weldment is effectively ensured; the qualified rate of the quick welding repair for the cracked container spreader in service is 100%; the use reliability of the spreader is ensured; and the service life of the spreader is effectively prolonged.

Description

technical field [0001] The invention relates to a loading and unloading machinery maintenance technology, in particular to a process method for crack welding and repairing of a container spreader. Background technique [0002] Container spreader is a special tool for loading and unloading containers. It is usually used in conjunction with loading and unloading equipment such as shore-to-shore container cranes, tire-type container gantry cranes, rail-mounted container cranes, rail-mounted container gantry cranes, and container straddle transporter gantry cranes. . [0003] The metal container spreader is assembled and welded by high-quality high-strength steel. Due to the long-term mechanical impact between the spreader and the container and the long-term oil corrosion, it is subjected to various alternating loads and pressures during use, so that the weld seam Defects produce stress concentration, and the effective use area of ​​the weld is reduced, which weakens the streng...

AI Technical Summary

Problems solved by technology

In the slightest, the service life of the spreader will be affected, and in severe cases, the weld seam will be broken, the product will be damaged, and serious accidents will be caused.

The spreader is composed of beams, guide plates, and baffles welded together. Cracks are most likely to occur and expand at the welded parts of these combined structures. The effective solution is to repair by repair welding. The welding repair process is very strict. If Improper operation can cause serious consequences

However, there is no effective welding repair process for the cracked metal structure of the special spreader for loading and unloading containers.