Over 17 years ago while working at John Deere, I got my first exposure to narrow groove welding. A Japanese company was actually achieving sidewall penetration with a GMAW process using a mechanically “kinked-wire” method. As you may know, a GMAW process relies on the heat of the arc to fuse metal. Deep in a groove, with an arc welding process there needs to be a way to direct the heat towards the sidewall.
Although, the “kinked-wire” method was slick, here at EWI – we opted for a different approach. We are actually rotating the lead wire in a tandem set-up and achieving some amazing results. Currently, our development torch is set-up to handle 5 inch thick joints. If you are not familiar with narrow groove welding, imagine the productivity improvements that can be achieved with these joint reductions.
Here is a sample of one of our welds. Imagine the distortion reduction compared to a single or double v-groove weld. If you are making these kinds of welds today, we would love to talk to you about your application.