Abstract
A 15 kW laser was used to produce autogenous welds in 12 mm (0.5 in) thick plates of three types of nigh strength low alloy (HSLA) steels (ASTM A633, A710/736, and A737). Mechanical properties (YS, UTS, Elong., RA and fracture toughness) were determined for the base plate and weldments. Microhardness tranverses were also made from the base plate through the heat affected zone (HAZ) and fusion zone. CVN values of autogenous welded ASTM A710/736 were compared to those of GMA welded and laser welded/Inconel alloyed fusion zone weldments. Also examined were the CVN values of the HAZ. A discussion on laser welding and how its rapid cooling effects microstructure and mechanical properties in HSLA steels will be presented.
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