Accession Number : ADA625636


Title :   Gas Metal Arc Weld (GMAW) Qualification of 7020-T651 Aluminum


Descriptive Note : Final rept. 1 Sep 2014-30 Sep 2015


Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE


Personal Author(s) : Chinella, John F ; Kapustka, Nick ; Shira, Seth


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a625636.pdf


Report Date : Nov 2015


Pagination or Media Count : 94


Abstract : This study determines weld joint characteristics of high-strength aluminum (Al), fusion-weld filler metals, Al-magnesium (Mg) alloys AA5087, AA5556A, and Al-Mg6-Zr fusion welded with the gas metal arc weld (GMAW) pulse (P) and spray (S) methods to AA7020-T651 Al. The study qualifies pulse and spray weld method weld joints of 25- and 40-mm-thick Al 7020-T651 plates with visual, radiographic, and metallographic examinations, and bend and tension tests. These fusion-weld filler metals and compositions have capabilities to better match the high strength levels of candidate Al structural and protection materials (e.g., Al-Zn-Mg 7020) for application to land vehicles. The 7020 alloy has demonstrated improved durability and shock resistance over the 7017 or 7039 alloys and improved yield strengths over 5083 and 6061 Al; therefore, high-strength Al, with tough, ductile, weld joints may provide improved protection and crash safety by means of a rigid vehicle structure. This investigation revealed 7020-T651 (has best tensile 43.4-46 ksi strength results) with 5087 filler and the GMAW-P-mode yield strengths of 28-31 ksi, and elongations of 6.8%-9.4%. The 7020 alloy is recommended as weldable with tensile strength requirements of 43-46 ksi.


Descriptors :   *ALUMINUM , *GAS METAL ARC WELDING , ALLOYS , HIGH STRENGTH , METALLOGRAPHY , QUALIFICATIONS , SHOCK RESISTANCE , SPRAYS , STRUCTURAL PROPERTIES , TENSILE PROPERTIES , WELDED JOINTS


Subject Categories : Metallurgy and Metallography


Distribution Statement : APPROVED FOR PUBLIC RELEASE