So now that we have the "puddle weld" term figured out, we can comment on the original post. If what you describe is correct, then you would need a WPS. You mention a "WPQR-01". Is that your WPS? If so there should be welding parameters and filler metal listed on it. If you don't have one, then you most likely will need to qualify one. The last coal burner I was involved in was Spruce II in San Antonio Texas, and oddly enough the coal handling piping was to AWS D1.1. The ASTM equivalent to your listed material is A532. That material is not listed in AWS D1.1, so you would need to qualify a PQ. It would be problematic for one us to just tell you what wire, and parameters to run. My thoughts anyway.