I only know of a few 115v Stick Welders that will burn in enough to hold a Wedge. All have Power Factor and put out true 100 Amps on 115v. If you have to use what you have, Pre Heat to 500 degrees. Buy a temp stick if you dod not have Acetylene. Heat til it melts and put in a multitude of passes with 3/32 7018. If you do have acetylene, Turn on Acetylene only and Smoke the area you want to weld. Then turn on the Oxygen and start to heat the smoked area. Do it slowly. When the Smoke color starts to go away, You are at 500 degrees. Let her rip with multiple passes and don't spare the Rods.