Abstract
In order to study the mechanism of hot cracking in aluminum alloys, the characteristics of brittle range existing behind the molten pool are investigated experimentally by using special tension executed soon after the welding. As to the characteristics of brittle range in weld metal, length, temperature range and minimum quantity of deformation necessary for a real rupture are examined.It is observed in the tention test of the specimen that there is a region rupturing with a small quantity of deformation and it exists in weld bead behind molten pool.Furthermore, it is confirmed experimentally that length of brittle range along the welding direction depends on heat input, welding speed, kinds of material, but not tension velocity with the range of 0.5, 12 mm/sec and not quantity of deformation.Temperature range of brittle range is determined by cooling curve at a certain point in weld bead and the length of brittle range. By this method, it is clarified that this value depends on kinds of material, but not welding condition and tensile velocity.Minimum quantity of deformation necessary for cracking (Δl) with no influence on expansion or contraction of specimen due to welding heat is measured by the method as shown in Fig. 14. It is clarified by above method that minimum deformation (Δl) is influenced by welding condition, tensile velocity and kinds of material, and is a very small value of 0.05-0.01 mm for high velocity welding bead and 0.10-0.05 mm for low velocity.
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