Abstract
Summary This paper describes an investigation of hard surfacing of aluminium alloy by conventional pulsed and low‐frequency pulsed MIG welding using a newly developed seamless cladding wire (copper sheath with solid aluminium wire as the inside core) of 1.6 mm diameter. Two cladding wires with different copper contents (34mass%Cu and 52mass%Cu) were tested. The effect of the shielding gas on the hardening characteristics and blowhole generation was also investigated. A Vickers hardness of Hv160–280 is obtained, being some 2–3 times greater than that of the base metal. Micro‐blowholes not detected by radiographic inspection mostly occur in the weld metal, tending to decrease with an increasing mixing ratio of helium gas.
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