← Glossary

Root protrusionexcess

Root bulge is an excessive, localized protrusion of the weld root on the back side that must be mechanically removed if it obstructs flow.

Physical-Chemical Mechanism of Action

Root buildup occurs due to too rapid cooling or excessively high welding pressure values. This leads to local solidification and formation of a root hump, which then creates mechanical obstacles.

Metallurgical Relevance & Welding Risks

Root buildup can cause hot cracking and component failure. It obstructs the flow of weld metal, leading to incomplete joints and lower strength.

Workshop Practice & Instructions

To avoid root buildup, watch for controlled cooling and proper welding pressure. If buildup exists, remove it mechanically with a fine burr or a pointed screwdriver to free the flow.

MetallurgieSchweißtechnik

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