Journal of Japan Institute of Light Metals · 2002 · 61 citations · 1 references
EngineeringMaterials EngineeringJoiningMetallurgyTribologyWeldingWelding ProcessesAluminum Alloy WeldingFrictionFriction WeldingJoint EfficiencySofteningWelded JointsWelding MetallurgyWelding Parameters
Underwater friction welding of 6061 aluminum alloy achieves significantly lower peak temperatures than atmospheric welding, and variations in friction pressure or time have little effect on the temperature. The study examined underwater friction‑welded 6061 aluminum joints produced with a brake‑type machine under varying welding conditions. Underwater welding produced joints with smaller total loss, narrower softening zones, and higher maximum efficiency (86 % vs 82 %) than atmospheric welding, though elongation was lower and fractures still occurred in the softened area under tension.
The some characteristics of the underwater friction welded joints of 6061 aluminum alloy, which were made by using a brake type friction welding machine, were examined with different welding conditions. The highest temperature of the friction welding process on the underwater welding was considerably lower than that of the atmospheric welding, and both friction pressure and friction time did not hardly affected to the temperature on the friction welding process. The total loss of the underwater welded joint became smaller compared with atmospheric welded joint, moreover the width of softening area on the underwater welded joint reduced and the softening ratio also decreased. The maximum joint efficiency of the underwater welded joint could be obtained 86%, it was slightly lager than that of the atmospheric welded joint which was 82%. The elongation of the underwater welded joints were lower than that of the atmospheric welded joint. Both the underwater and atmospheric welded joints fractured in the softened area under the tensile load.
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