Demystifying powder coating over welds
If you weld parts and then powder coat over them, you
may have had some problems with adhesion. You’re not
alone. From the number of questions we receive on this
topic, many coaters have experienced this problem. This
article discusses the most common types of welding
methods and explains how to promote adhesion in a few
simple steps. One thing to keep in mind, you won’t find
any shortcuts to handling the problem.
Welding unites pieces of metal or plastic by
heating until molten and fused or until soft
enough to hammer or press together1. What
has this to do with powder coating, and why is this topic
in a finishing magazine? Because welding affects the
powder finish and the coating performance, and because
we are frequently asked why powder coating doesn’t
adhere in the relatively close area of a welded junction.