在铸件生产过程中经常会出现裂纹、气孔等铸造缺陷,对于这类缺陷常用焊补的方法予以修复。目前铸铁焊补最常用的方法是冷焊,冷焊不但具有成本低、速度快的优点,而且还能满足焊补质量的要求。下面就分三方面将影响铸铁冷焊质量的不良因素及防止方法介绍如下。一、导致焊补区组织过硬的原因及防止方法1.半熔化区形成白口组织。焊后经机械加工或打硬度发现,沿焊补区周围一圈组织过硬。这主要是由于焊后未采取有效的保温措施和冷却速度过 Casting in the production process often cracks, porosity and other casting defects, for such defects commonly used welding repair method to be repaired. At present, the most commonly used method of cast iron welding repair is cold welding, which not only has the advantages of low cost and high speed, but also meets the welding quality requirements. The following three points will affect the quality of cold-welded cast iron adverse factors and prevention methods are described below. First, lead to the cause of the welding area and improve the prevention of 1. Semi-melting zone to form white tissue. After welding machining or hitting hardness found along the area around the welding repair organizations excellent. This is mainly due to the welding has not taken effective insulation measures and cooling rate too