What went wrong here?. Its a stainless steel structural joint

Look down hill.
Imperfections: poor profile, slag inclusion.

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Do u have any qualified wps? or a qualified welder .
weld looks so filthy

It’s a canopy support, which received from a supplier. WPS and WQT’s requested.But how the slags look like tar and sticky.

If not necessarily, you may clean up the heat tint and then pickling.