Upon inspection, the weld joins were found to be discoloured, the spot welded joints had not been lacquered / coated after welded, so the black weld marks are visible.
Almost. anonymous after welded This is the only phrase that isn't right. after welding', 'after being welded' or 'after having been welded'.
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Almost.
anonymousafter welded
This is the only phrase that isn't right. Use '...after welding', 'after being welded' or 'after having been welded'.