Arc welding : How do I prevent these 'bubbles' from forming? How can I close them without grinding?
I'm self taught, was joining these diesel tanks to make water tanks, so the materials are the same thickness. As has happened many times before with other jobs these 'bubbles' form. It never really bothered me, but it turns out that water will leak out of the flux pool center. After much grinding my teeth and using the angle grinder the job is now complete and watertight. I would really like an experienced welder to give some advice.