A laser repair method for the surface of ball-ground cast iron

A technology of ductile cast iron and laser repair, which is applied in the field of materials, can solve problems such as cracking at the interface between the cladding layer and the substrate, and achieve the effect of small thermal influence and high bonding strength
CN105177569BActive Publication Date: 2017-12-15WUHAN HGLASER ENG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
WUHAN HGLASER ENG CO LTD
Publication Date
2017-12-15

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Abstract

The invention provides a method for laser repairing the surface of spheroidal cast iron, comprising the following steps: 1) preparing powder material for laser repairing spheroidal cast iron; 2) pretreating the area to be clad; 3) preheating the base material; 4) Multi-layer cladding is carried out on the damaged part of the surface of the spheroidal cast iron. The single layer thickness of the cladding layer is 1.2-1.3mm. 2mm; 5) After cladding, the nodular cast iron is cooled to room temperature, and the colorant is sprayed to check whether there are crack defects; 6) The cladding repair layer of the nodular cast iron is machined to remove the protruding coating on the outer surface of the damaged part. The cladding area formed by this method has no crack defects and has little thermal influence on the base material. The interface between the cladding layer and the ductile cast iron base material shows a discontinuous melting trend, and the interface is a typical jagged shape. The bonding strength is high and the interface is avoided. Cracks occur due to the formation of continuously transformed ledeburite.
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Description

technical field

[0001] The invention belongs to the technical field of materials, and relates to a laser cladding method, in particular to a laser repair method for the surface of ball-ground cast iron. Background technique

[0002] Ductile iron is a high-strength cast iron material developed in the 1950s. Its comprehensive properties are close to those of steel. It has good wear resistance, shock absorption, insensitivity to notch and excellent casting performance. Higher than gray cast iron, it is commonly used in industry to make large mold parts. However, in actual use, due to the long-term complex loads on the mold surface, the surface of the ductile iron mold is easily damaged, resulting in mold failure.

[0003] In the industry, the manual welding method is commonly used to repair the defects on the surface of the mold, but the heat input of this traditional method is too large, which has a great thermal impact on the base material, resulting in excessive residual st...

Claims

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