Abstract
The effect of heat input on mechanical properties of thick 5083-O welds were investigated using high current MIG process. The results obtained are as follows:1. Mechanical properties of Al-Mg alloy 5083-O welds are.influenced markedly with the change of heat input. To be specific, tensile strength, yield strength, elongation and reduction in area tend to be lowered with increase in heat input.2. Heat input'per unit plate thickness must be kept below 20kJ/cm/em to satisfy the required strength, 28 kg/mm2, for JIS specified value (base plate; 4.6% Mg, electrode wire; 4.9% Mg)3. Permissible heat input can be increased by increasing Mg content of base, plate and electrode wire.4. Deterior ation in mechanical properties due to the increase in heat input isinfluenced both by composition factor, i. e., variation in Mg content due to dilution or vaporing loss and by structural factor, i. e., solidification structure of-weld metal.
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