Metex Corporation
Alabama Specialty
Welded Coupons
Welded Coupons
USA Toll Free: 1-800-730-0302 Tel: 416-240-1920 - sales@metexcorporation.com
Welded Coupons
Ideally, the coupon used should be the same thickness and welded with the same welding process as the material used in the production equipment. Usually this is not practical so a representative sample must be studied. Typical welding techniques used are Shielded Metal Arc (SMAW), Gas Tungsten Arc (GTAW), and GAS Metal Arc (GMAW). Specimens are ground smooth after welding, unless otherwise specified, so as to provide a uniform surface for microscopic investigation. Welded coupons can be prepared with or without the use of filler metal. The autogenous weld is prepared without the use of filler metal. This type of weld is the most economical method. Autogenous welds are commonly used to evaluate corrosion rates of welded materials and the usage of these materials in corrosive environments. An autogenous weld is produced by GTAW and can be used to test material weldability and gas shield usage, and to set welding parameters. |