A surfacing welding process method for repairing cast steel anchor lip line

Abstract

The present invention proposes a surfacing welding process method for repairing the cast steel anchor lip line shape, comprising the following steps: step 1, grinding the surfacing welding area of ​​the anchor lip; step 2, preheating the surfacing welding area of ​​the anchor lip; step 3 , Preparation before welding: select the welding filler material, shielding gas and the flow rate of the shielding gas; step 4, select the welding parameters to carry out welding; step 5, perform slow cooling after welding; step 6, grind the surface of the surfacing weld. The surfacing welding process method of the cast steel anchor lip line repair in the present invention mainly uses grinding and preheating to provide a suitable welding foundation, and different welding parameters are used for different welding positions in the welding process to realize the steel casting anchor Lip line repair. The invention can effectively avoid the generation of welding defects such as pores, cracks, slag inclusions, etc., and efficiently realize the linear repair work of the cast steel anchor lip.

Description

technical field [0001] The invention belongs to the technical field of ships, and in particular relates to a surfacing welding process method for repairing the line shape of cast steel anchor lips. Background technique [0002] Steel casting materials have good design flexibility and short lead time. Therefore, the anchor lip structure with special shape requirements is usually designed with carbon steel and carbon-manganese steel casting materials. However, anchor lip castings are large-scale structural parts with a weight of several tons. It is difficult to accurately control the accuracy of their shape and size during the casting process, which affects their aesthetics and performance, especially the concave parts of the structure, which are usually structural parts. weak areas. Under the action of sea wind and waves, the weak area of ​​the anchor lip will easily cause the risk of damage and damage after the anchor lip structure collides with the anchor, anchor chain, wh...

AI Technical Summary

Problems solved by technology

However, since steel castings usually contain a large amount of residual impurity elements such as Cu, Cr, Ni, Mo, etc., and there are still a large number of structural defects in the structure, such as porosity, shrinkage cavity, microcracks, etc., which reduce the weldability of steel castings, After surfacing welding, it is easy to form welding defects such as pores, cracks, and slag inclusions in the surfacing welding area

[0004] In the prior art, the surfacing welding process usually uses electrode arc welding for welding. Although the electrode arc welding process has strong adaptability, this method has disadvantages such as low welding efficiency and large welding spatter.

Since the cast steel material contains a large amount of impurity elements, a large number of structural defects, and poor weldability, if carbon dioxide gas shielded welding is used for welding, the heat input will be larger, and the amount of base metal melted into the weld bead during the welding process will increase. The fusion of the base metal will increase the content of impurity elements in the weld bead, and it is easy to generate welding defects in the surfacing weld bead, especially welding crack defects

Therefore, the welding process of conventional carbon dioxide gas shielded welding is not suitable for the surfacing welding of steel castings, and the welding parameters need to be strictly controlled to reduce the amount of impurity elements.

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