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One of the major limitations in the practical application of welding is the deleterious effect the welding operation has upon the base metal. Since arc welding consists essentially of depositing molten metal at the junction of the sections to be welded, the metal immediately adjacent to the fusion zone is unavoidably heated to all temperatures up to the melting point of steel, the maximum temperature attained at any point being inversely proportional to the distance from the fusion line.

The Forbes bar method has been considerably modified and adapted to the problem of measuring the thermal conductivity of metals and alloys in the temperature range from 0° C to 1000° C. A complete mathematical analysis of the heat flow problem existing in the furnace is presented, which substantiates the approximate one which have been made by several authors in the past employing this basic technique. The electrical and thermal conductivities of nickel, inconel, several stainless steel alloys, and 99.99% pure aluminum are reported.