Arc - Alloy Welding Ltd was formed and incoprorated in October, 1967 in Edmonton, Alberta, under the management of John and Nettie Kerpan. Most of the company work involved the oil field industry in Alberta and Northern British Columbia.

In 1969, after exploring the potential for its services, the company moved its operation to Colonsay, Saskatchewan. The shop was set up in May, 1969 and was open for business in June of that year. In 1975, as business increased, the facility was expanded. More equipment was installed to meet the demand for more services.

Bill Stirton joined the company in January, 1974. He and his wife, Peggy, bought the business upon the Kerpans retirement in August, 1984 and it became Arc Alloy Welding (1984). It remains under their ownership.

Since then, Arc Alloy Welding (1984) has provided custom fabrication and repair services to the potash industry and the surrounding agriculture community, as well as developing the PRO GRAIN Equipment line manufactured within the Colonsay facilities.