The Influence of Heat Input on the Fracture and Metallurgical Properties of HSLA-65 Steel Welds – Fabrication conditions, Tensile, Impact and Microstructures


  1. Bayley, C.
  2. Mantei, A.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);Victoria Univ, Victoria BC (CAN) Dept of Mechanical Engineering
HSLA-65 steel (ASTM A 945-05) is regarded as an excellent naval ship steel. Its low carbon equivalent and strength-to-weight ratio make it a candidate for future Canadian naval platforms. Unlike previous naval platforms, future ships might be expected to be deployed to Arctic waters. This increased operational requirement imposes a strict fracture toughness criterion for both the base metal and welds. In particular, the heat affected zone near the weld is of concern, especially for high heat input processes. In this study, welds were fabricated using the flux core arc welding and Gas Metal Arc processes with variations in the welding heat input and welding consumable. While all of the welded panels exhibited satisfactory tensile and hardness properties, a dramatic shift in the ductile-to-brittle transition temperature to higher temperatures was observed for high heat input conditions when the notch was positioned within the heat affected zone. The interpretation of this shift in transition behaviour was confounded by the relative width of the coarse grained heat affected zone, the microstructure sampled by the advancing crack and the position of the blunt Charpy notch.

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Report Number
DRDC-ATLANTIC-TM-2008-130 — Technical Memorandum
Date of publication
01 Oct 2008
Number of Pages

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