{"id":832,"date":"2025-03-03T20:41:53","date_gmt":"2025-03-03T17:41:53","guid":{"rendered":"https:\/\/www.hitsauskurssi.fi\/?p=832"},"modified":"2026-01-21T22:05:22","modified_gmt":"2026-01-21T19:05:22","slug":"korjaushitsaus-kaytannon-esimerkilla","status":"publish","type":"post","link":"https:\/\/www.hitsauskurssi.fi\/en\/korjaushitsaus-kaytannon-esimerkilla\/","title":{"rendered":"Repair welding with a practical example"},"content":{"rendered":"
\"Korjaushitsaus<\/figure>\n\n\n\n

Repair welding is one of the undeniable strengths of MIG\/MAG welding. Especially in hands-on, non-digital businesses, repairing various work machines, equipment, and structures is part of everyday life. Brackets break, frames bend, and cracks appear. And in situations like these, MIG\/MAG welding shines. The same applies to any environment where steel structures are part of daily operations\u2014from a technical prototyping workshop to a janitor\u2019s tool shed, not to mention mechanics and repair professionals. That\u2019s why, in my opinion, every company should have a small set of high-quality welding equipment waiting in the workshop corner\u2014and at least one skilled person to use them.<\/p>\n\n\n\n

Fundamentally, repair welding is the same as welding a brand-new piece\u2014at least when it comes to the welding itself. The biggest difference lies in the preparation of the area to be repaired before the actual welding, as well as, depending on the case, the post-processing.<\/p>\n\n\n\n

In this article, we\u2019ll go through a real-life example of repairing a broken part of a work machine.<\/p>\n\n\n\n

Quick links to content:
Mental preparation<\/a>
Removing and cleaning the parts<\/a>
Surface preparation and tools<\/a>
Repair welding<\/a>
Finishing after welding<\/a><\/p>\n\n\n\n

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Mental preparation<\/h2>\n\n\n\n

First and foremost, written in bold letters:<\/strong> preparing the parts usually takes much more <\/em>time than the actual welding. When working with new pieces, this varies, but in repair welding, preparation can easily take up 95% of the total work time. Before you get to the welding, you\u2019ll need to clean, fit, protect, adjust, refit\u2026<\/p>\n\n\n\n

Accept this fact and take your time with the preparation. This phase is just as much a part of the repair process as the welding itself. You\u2019ll save yourself a lot of frustration by doing it properly and thoroughly. Plus, good preparation has significantly<\/em> impact on how enjoyable the job is to do.<\/p>\n\n\n\n

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Removing and cleaning the parts<\/h2>\n\n\n\n

This particular job was to repair a broken bracket of a protective casing from a heavily used stump grinder. Casing material unalloyed steel. A very typical repair task. The casing was powder-coated and, over the years, had been soaked in grease and covered in dirt. The work began by dismantling the casing from the machine.<\/p>\n\n\n\n

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\"Ty\u00f6koneen
The casing is still in place. The bracket has cracked along the original weld due to vibration.<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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\"Ty\u00f6koneen
The casing has been removed, and the bracket is on the workbench for inspection.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n

This particular bracket was a fairly grateful repair job because the crack was caused by vibration rather than impact. The bracket remained in its original shape and fit perfectly back into place. Often, this isn\u2019t the case\u2014parts may need to be bent and reshaped to fit, or in many cases, a completely new piece must be made.<\/p>\n\n\n\n

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\"Kotelo
The casing on the workbench. Working with parts taken of is much easier than struggling inside the machine.<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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\"Kiinnike
A fortunate and easy break location\u2014the bracket fits back into place perfectly.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n

When working with new pieces, surface cleaning is usually a quick and easy process. In repair welding, however, this step requires significantly more effort.\n\nI start by scraping off any loose debris, sand, and dirt. For this, I use a sacrificial junk knife, but any scraping tool will do. Next, I wipe away the ingrained dirt and grease by vigorously scrubbing with a coarse cotton rag. A degreaser can be used if desired, but personally, I don\u2019t find it necessary.<\/p>\n\n\n\n

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\"Esipuhdistusv\u00e4lineet.
Pre-cleaning tools \u2013 a sacrificial knife and a coarse rag.<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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\"Esipuhdistettu
The bracket, cleaned of loose dirt.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n
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Surface preparation and tools<\/h2>\n\n\n\n

Next, it\u2019s time to remove the paint and prepare the welding surfaces. When working with new pieces, an angle grinder and a flap disc are often enough. However, in repair welding, you usually need to reach into corners and recesses where a flap disc won\u2019t fit, so a few extra tools are usually necessary.<\/p>\n\n\n\n

My go-to tool list looks like this:<\/p>\n\n\n\n