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为了有效地降低铸造车间废品率,提高铸造生产的经济效益,大多数铸造车间在不影响铸件使用性能、加工性能和外观质量的前提下,对铸件部份铸造缺陷、如气孔、砂眼、渣孔等都尽可能采取修复挽救措施。有条件的工厂将铸件焊补列入铸造生产的一道正常工艺,从而使铸造废品率降到10%以下。目前一般的挽救手段是:电弧冷焊、气冷焊、(火千)焊、气热焊、胶补等。由于铸铁的脆性特点,对冷却速度的敏感以及生产工艺特性等因素的影响,使铸铁的焊接性能很差,
In order to effectively reduce the rate of foundry rejects and improve the economic benefits of foundry production, most foundry shops, on the premise of not affecting the serviceability, processability and appearance quality of castings, cast some casting defects such as pores, blisters and slag holes And so are as far as possible to take remedial measures. Conditional factory welding castings will be included in the casting production of a normal process, so that the casting scrap rate dropped below 10%. The general means of saving are: arc cold welding, gas-cooled welding, (Fire Thousand) welding, gas welding, plastic fill and so on. Due to the brittleness of cast iron, the sensitivity to the cooling rate and the influence of the production process characteristics and other factors, the welding performance of cast iron is poor,