Waveform Controlled Gas Metal Arc Welding of Corrosion Resistant Alloys Without Back-Purging

Backing gas is typically used in open-gap root welding of corrosion resistant alloys, such as austenitic stainless steels to protect from atmospheric contamination, oxidation, and loss of alloying element. Back-purging can be costly or impractical due to access restrictions, personnel safety, or economic factors. Efforts using waveform controlled gas metal arc welding (GMAW) to eliminate the need for back-purging have been reported to achieve code acceptable welds with excellent corrosion resistance. However, results in the literature are sparse and presented somewhat superficial, hindering further application of the technology.

 

Industry Sponsor: Lincoln

Faculty: Carolin Fink, Narasi Sridhar

Graduate StudentJeremy McNicol

Industry Contact: Badri Narayanan, Michael Kottman, Steve McCracken