Welding Test 196, Tensile Strength of Welded Joints in Special Treatment Steel with 25-30 Electrodes.

The principal purpose of these tests was to determine the relative effects of machined edges and edges cut automatically by gas, on the static tensile strength of a welded connection. Welds made in plating with machine gas-cut edges are not inferior in static tensile strength to welds made in plating where edge preparation is done by machining. In light plating 25-pound the single-vee butt weld appears to be the optimum type for static tensile strength. In medium plating 40-pound the single-vee butt joint and double-vee butt offer no choice in static tensile strength. The single-vee with the backing strap presents considerable irregularity in tensile performance, and therefore is less reliable than the two connections previously mentioned, although stronger in many cases. The nature of the data on the 60-pound plating precludes a definite conclusion. However, indications are that the scarf joint is the best tensile type.