Search This Site

(Search by Product Type i.e. Level or Brand Name i.e. Walchem)

Welded Coupons

USA Toll Free: 1-800-730-0302 Tel: 416-240-1920 -

Corrosion Monitoring,Instruments,Meters

Welded Coupons

Corrosion rates can vary between welded and non-welded metals, therefore it is advisable to study the behavior of both conditions. Studies involve examination of the parent material, the heat-affected zone, the weld metal, and the interfaces between all metals involved. The surface effects produced by welding, heat-tint formation or oxidation, fluxing action of slag, and the deliquescence of slag can be important factors in the corrosion behavior of metals.

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.
Corrosion Coupons - Welded

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.

Welded Coupons


About Us

Metex Corporation Limited has been providing superior products and services to the process control, chemical treatment, waste water, industrial and manufacturing industries for over 25 years. It is our goal to continually provide our customers with the best possible equipment, technology, and service.


Our Products

Dataloggers, sensors, pumps, recorders, hand held instruments, flow instrumentation, level controls, valves, instrumentation, containers, tanks, transmitters, data loggers, digital indicators, mixers and agitators, pressure intrumentation, analyzers and controllers for a variety of industrial applications such as water quality, pH/ORP and more.

Website Content

Water Analyzers and Controllers, Wireless Products, Corrosion Monitoring Equipment, Cooling Tower and Boiler Controllers, a wide variety of Pumps, Valves, Dataloggers and Recorders, HVAC, Instrumentation, Skids and Systems, Containers and Tanks from world leading manufacturers are products you will find on this site.

Get in Touch