INVESTIGATION TOWARD OBTAINING SIGNIFICANTLY HIGHER MECHANICAL PROPERTIES OF AS-WELDED JOINTS IN HIGH-STRENGTH, HEAT TREATABLE ALUMINUM ALLOYS
Abstract
Welding techniques, filler metal-parent metal selection and moderate temperature post-weld thermal treatments to achieve tensile strengths up to 72, 000 psi in welded heat treatable AlALLOY SHEET ARE DISCUSSED. The Al-Zn-Mg-Cu alloys 7075 and 7178 welded with Al-Mg or Al-MgZn filler metals gave higher as- welded strengths than the Al-Cu alloys 2219 and 2014. The 7075 and 7178 showed excellent response to post-weld aging when welded in either -W or -T6 tempers. Tensile strengths of 70-72,000 psi were achieved in 1/8-in. 7178-T6 sheet welded with Al-Mg-Zn filler metal. Welds in 7075-T6 attained about 68,000 psi tensile strength when post-weld aged 168 hrs at 212 F. Both tensile and bulge strengths were about 15,000 psi higher for postweld aged than for as-welded joints. Direct current, straight polarity W inert gas welding with He gave the most consistently high strengths.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 06, 1961
- Accession Number
- AD0268649
Entities
People
- F. R. Collins
Organizations
- Alcoa