Practical Ideas for the Design Professional by Duane K. Miller, P.E.

An Efficient Technology

A welding system featuring opposing arcs is commonly used to weld stiffeners to webs on bridge members. In concept, opposing arc systems can be used to fabricate any tee joint configuration requiring fillet welds on both sides of the vertical member.

Originally developed by Ogden Engineering and promoted as the “Dart Welder,” thishighly efficient technology permits horizontal fillet welds to be made simultaneously on either side of a tee joint. Since welding is done in the horizontal position, the maximum fillet weld leg size is typically 5/16 in (8 mm). It is commonly applied in stiffener-to-web connections, and may also be used for web-to-flange connections. The system is illustrated in Figure 1.

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