| 摘要 |
<p>The invention relates to a method for forming a welded joint (11) between abutting pieces of steel (12). The welded joint (11) is produced by first forming a strength weld (16) and then depositing additional weld metal on the toe (22) of the strength weld (16) to form a toughness weld (23, 24). The fusion interface of the toughness weld forms a minimum angle with the direction of maximum tensile load across the welded joint (11). The toughness toe (26) is separated from the heat-affected zone (27) of the strength weld (16) to effectively prevent propagation of a crack initiated at the toughness weld toe (22) into the heat-affected zone (27) of the strength weld (16). The welded joint (11) so produced is substantially resistant to failure by brittle fracture.</p> |
