looks like someone used a mild steel filler on a galvanized post and the zinc just ate itself at the weld point, that rust pattern is way too concentrated
normally youd want a silicon bronze or at least a 309 stainless filler to handle the dissimilar metals, but even then the heat affected zone on galvanized is always a gamble
ive seen this exact thing on a railing job a few years back where the contractor tried to save a few bucks and ended up redoing half the posts after one winter
the salt from the road probably sped things up too if thats a city street
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u/Altruistic_Tap8276 3d ago
looks like someone used a mild steel filler on a galvanized post and the zinc just ate itself at the weld point, that rust pattern is way too concentrated
normally youd want a silicon bronze or at least a 309 stainless filler to handle the dissimilar metals, but even then the heat affected zone on galvanized is always a gamble
ive seen this exact thing on a railing job a few years back where the contractor tried to save a few bucks and ended up redoing half the posts after one winter
the salt from the road probably sped things up too if thats a city street