Repairing method of gray pig iron heterogeneous welding line

Abstract

The invention discloses a repairing method of a gray pig iron heterogeneous welding line. The method comprises the steps of preweld cleaning preparing, welding current selecting, adopting the heterogeneous welding material EZNiFe for gray pig iron cold welding, postwelding hammering and the like. The repairing method of the gray pig iron heterogeneous welding line is provided for overcoming the defects that an existing gray pig iron casting generating cracks and other defects is not prone to being repaired, in the welding repair process, the welding line plasticity is low, and the welding linestrength is poor; the repairing method of the gray pig iron heterogeneous welding line mainly uses the heterogeneous welding material EZNiFe for gray pig iron cold welding, the welding line plasticity is improved while it is ensured that the welding line strength is not reduced, the white cast of the welding line is reduced, the casting obtains the good cutting machining property, and the traditional gray pig iron welding line is converted into the heterogeneous welding line from the homogenesis welding line.

Description

technical field [0001] The invention belongs to the technical field of casting repair in mechanical manufacturing, and in particular relates to a repair method for heterogeneous weld seams of gray cast iron. Background technique [0002] At present, heavy machinery companies such as steel mills produce a large number of castings every year. These castings will be damaged to varying degrees during use. If cracks appear, the products will be scrapped. If a new one is replaced, it will be impossible to purchase it in a short period of time, which will seriously affect production, and some castings will be machined, and the price is very expensive. If it can be repaired by welding in time, it will not only save time, but also save a lot of money. At present, the commonly used grade of gray cast iron is HT-200. The chemical composition of this material is characterized by high carbon and high content of sulfur and phosphorus impurities. Traditional welding materials use "Z248" a...

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Problems solved by technology

[0011] The purpose of the present invention is to overcome the characteristics of existing gray cast iron castings that have defects such as cracks that are not easy to be repaired, and the welding seam has low plasticity or insufficient weld seam strength during the welding repair process, and provides a repairing method for gray cast iron heterogeneous weld seams Method; the repair method of a gray cast iron heterogeneous weld of the present invention mainly utilizes the heterogeneous welding material EZNiFe to carry out cold welding of gray cast iron, while ensuring that the weld strength does not decrease, the plasticity of the weld can be improved and the weld loss can be reduced. White mouth, so that the casting can obtain good machinability, so that the traditional gray cast iron weld can be transformed from a homogeneous weld to a heterogeneous weld

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