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Welds and appearance of the galvanized surface

Working with welds

Welding metal structures with hot-dip galvanizing, the presence of welding seams and the very purity of the welding areas significantly affect the appearance of the product and the quality of the zinc coating in the weld area.

During the manufacture of metal structures at the end of welding splashes and slag are formed, which must be cleaned before galvanizing. If this is not done, the zinc coating itself will not be able to stick properly and will leave uncovered areas.

In the process of preparing the product for hot-dip galvanizing, special chemical solutions are used, but which still can not completely remove the slag and welded flux. This suggests that grinding, abrasive blasting, chipping, fire cleaning or wire brush should be mandatory.

Welds and appearance of the galvanized surface

In the process of melting the metal is formed welded slag, which begins to melt when exposed to a welding electrode or wire and eventually settles in the formation of seams. That is why welds, which are formed using coated wire, allow the formation of welded slag. When performing bare wire welding seams, they are not sensitive to the welding process and as a result do not need to be cleaned with abrasives for such specific tasks.

Below in the table is a list of welding processes and their potential for the formation of welding slag:

Welding process

Presence of welding slag

Manual arc welding process

Present, the electrode is covered with flux

Powder arc welding

Present, the electrode is covered with flux

Arc-flux welding

Present, the presence of granular flux

Gas arc welding of metal/ gas inert welding


Gas tungsten arc welding/inert gas welding


Plasma welding type


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