Method for repairing and welding copper mold bottom plate made of nodular cast iron

Abstract

The invention provides a method for repairing and welding a copper mold bottom plate made of nodular cast iron. The method comprises the following steps that 1, a to-be-repaired part of the copper mold bottom plate is cleaned and ground until metal luster is exposed; 2, a bevel edge U-shaped groove is opened on the to-be-repaired part of the copper mold bottom plate and cut and ground; 3, metal isfused in the bevel edge U-shaped groove, and the bevel edge U-shaped groove is fixed to the copper mold base plate base material together by using carbon steel bolts; 3, a crack arrest hole is formedin the position of 50mm-100mm, away from the to-be-paired part of the copper mold bottom plate, and a carburized layer of the hypotenuse U-shaped groove carries out cutting and grinding treatment; 4,the to-be-repaired part of the copper mold bottom plate is locally preheated; 5, a bottom layer of the to-be-repaired part of the copper mold bottom plate is welded by using a baked J506 type weldingrod; 6, a copper mold bottom plate crack welding area is slowly cooled after slow cooling by adopting a heat preservation and slow cooling mode. According to the method, the strength and the fusion of a weld joint of the copper mold bottom plate can be improved, and the problems of weld crack and sheet peeling of the copper mold bottom plate after welding are effectively solved.

Description

technical field [0001] The invention belongs to the field of welding forming and control, and in particular relates to a method for repairing and welding a copper mold bottom plate made of ductile iron. [0002] technical background [0003] The copper mold bottom plate used in the production process of the pyrometallurgy system is mainly used for casting copper molds when producing copper anode plates. During casting, high-temperature liquid miscellaneous copper is poured on the surface of the bottom plate of the copper mold at 1100-1270°C, cooled after casting, and the mold is lifted by a crane in a red-hot state to complete the casting operation of the copper anode plate. However, the thermal conductivity of the copper mold is poor, and the surface temperature rises instantaneously during casting. The surface and internal temperature of the copper mold are uneven, resulting in temperature difference stress. The phenomenon of shedding and cracking of the surrounding corner...

AI Technical Summary

Problems solved by technology

However, the thermal conductivity of the copper mold is poor, and the surface temperature rises instantaneously during casting. The surface and internal temperature of the copper mold are uneven, resulting in temperature difference stress. Phenomenon of shedding and cracking of peripheral corners

The crack depth is generally 40-50 mm, and the width is generally 2-5 mm, resulting in uneven surface of the cast model, and the size does not meet the standard requirements, which seriously affects the product quality of the copper anode plate

However, the above phenomena will appear after the copper mold casts 20-30 pieces of copper anode plates. The replacement of the whole batch will inevitably cause waste of materials and increase the material cost per unit of production. Therefore, it is very useful to repair the defective copper mold bottom plate. necessary

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