Besides the super obvious burned-to-hell welds, porosity may look kinda lumpy or like a whitehead zit, or may just have a few visible pin-holes. The lumpy and whitehead ones especially may be a lot worse than they look, so when it doubt, grind them out.
Steel is not a great conductor. Ground as close to practical is good, especially on a transformer machine with limited power. I don't think you'd use the magnetic ground for long. They don't ground all that well, and the magnet can cause arc blow when you're welding near to it. Get a good cast copper clamp.
Steel is not a great conductor. Ground as close to practical is good, especially on a transformer machine with limited power. I don't think you'd use the magnetic ground for long. They don't ground all that well, and the magnet can cause arc blow when you're welding near to it. Get a good cast copper clamp.
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