Heres another tip for improving your tool: Go to Harbor Freight and get their el cheapo 12" crescent wrench. Weld your homemade set of adapters to both sides of the jaws of the wrench. That way they can be opened wider or narrower if needed and the handle is built in.
Looks like you are welding with flux core wire. If you ever get a gas tank and go to solid core wire, your welds will be prettier with better penetration and less spatter.
Randy Rosetta KDØKWX TLCA #19351 69 FJ40 "Meanie" & 1970 Boss 302 Mustang