{"id":8130,"date":"2026-10-26T02:14:46","date_gmt":"2026-10-26T02:14:46","guid":{"rendered":"https:\/\/chinametalfoundry.com\/?p=8130"},"modified":"2026-10-26T02:14:46","modified_gmt":"2026-10-26T02:14:46","slug":"casting-weld-repair","status":"publish","type":"post","link":"https:\/\/chinametalfoundry.com\/de\/blog\/casting-weld-repair\/","title":{"rendered":"Casting Weld Repair: Rules, Standards and Real Cost Math"},"content":{"rendered":"
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Repair it or scrap it. Every casting buyer eventually faces that choice after a shrinkage cluster shows up on a radiograph, an inclusion appears on the machined face, or a valve body weeps at the pressure test. Casting weld repair<\/strong> is legitimate under almost every major specification \u2014 but it is legitimate only inside a narrow frame: a qualified welding procedure, the right filler metal, controlled preheat and post-weld heat treatment, and records that survive audit. Miss any one of those and you may end up with a part that looks repaired rather than one that is.<\/p>\n<\/div>\n

This guide draws on published material from the American Foundry Society (AFS)<\/a>, the Steel Founders\u2019 Society of America (SFSA)<\/a> and ASTM welding practice, and puts casting weld repair into three sets of verifiable numbers: preheat temperatures derived from two carbon-equivalent calculations (0.42 and 0.66), the three documents that must reach your inbox before an arc is struck, and cost models for three real parts. One of those models shows repair costing $55.00 more than a brand-new casting \u2014 welding it would be the wrong call.<\/p>\n

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Figure 1: a ground-out V-groove and weld deposit on a machined boss. Nothing about the repair matters more than whether the cavity was excavated to sound metal.<\/figcaption><\/figure>\n

What Counts as Repair \u2014 and What Already Breaks Your Specification<\/h2>\n

Before discussing casting weld repair, it helps to sort the dispositions. There are four outcomes for a casting defect, and only the second is a repair in the metallurgical sense. Which one applies mostly follows from the defect type, covered in our guide to common casting defects<\/a>.<\/p>\n