Tensile and Fatigue Properties of Large Structural Members by a Newly Developed Welding System(Mechanics, Strength & Structure Design, INTERNATIONAL SYMPOSIUM OF JWRI 30TH ANNIVERSARY)

概要

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In the civil engineering and architecture fields, welding of large sectional members, such as I section and H section steels, are usually required. A flash welding system, by which large I section steel or H section steel can be welded for a short time, was newly developed to shorten the joining time of large sectional members. The joining time of rolled SS400H section steel (300×300×10×12 ((mm)) was about 5 minutes (Joining time was 1/10 compared with that of arc welding). From the results of tensile tests, the joint efficiency of welded joints by the newly developed flash welding system was 100% for the specimens with reinforcements and 93% without reinforcements. In fatigue tests, the fatigue strength of welded joints with reinforcements was about 50% of that of the base metal. By removing the reinforcement naturally generated by flash welding, the fatigue strength of flash welded joints became 75% of that of the base metal. In fatigue design, flash welded joints with reinforcement had the same grade of fatigue strength as the non-load-carrying fillet joints by arc welding.
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