Development of Low Cost Filler Materials for Welding High Strength Steels

摘要

HY130 is a quenched and tempered steel designed for high strength and good toughness in the as-welded condition. The welding consumables, however, are fairly expensive and the available sources limited. A study was conducted to determine the feasibility of synthesizing the desired composition in the weld pool using the Shielded Metal Arc (SMAW), Gas Metal Arc (GMAW), and Submerged Arc (SAW) welding processes. This was accomplished by feeding two commercially available materials into the weld pool in appropriate proportions. In the SMAW and SAW deposits adequate mixing of the two materials was achieved. Some inhomogeneities were observed in the GMAW deep penetration finger. This slight lack of mixing could be improved through further process development. Weldments produced with all three processes met the yield strength and elongation requirements for 140 filler materials. Dynamic tear tests conducted on submerged arc weldments came close to meeting the requirements while weldments produced with the other processes were somewhat lower. This was thought to be due to higher than allowed residual element levels and could be improved through optimization of starting material compositions. The techniques developed in this program have shown potential for obtaining weld metals of specific compositions for high strength steels at reduced cost. (Author)