Either TIG or MIG welding can be used. We used a TIG machine. Since these custom joints are part of a suspension, a failed weld could lead to disastrous results. This shouldn’t be your first welding project. If you need custom Johnny Joints but aren’t an experienced welder yet, you’d be wise to pay someone else to weld them for you. We welded in two passes. This photo shows the first pass, sometimes called the root pass.