INVESTIGATION OF MODIFIED POSITION, DOWN-HAND MIG WELDING OF 2014-T6 ALUMINUM ALLOY.
Research and development rept.,
DOUGLAS AIRCRAFT CO INC SANTA MONICA CALIF
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An investigation was made of the effects of varied welding positions on weld qualities such as weld deposit soundness and uniformity, bead geometry, chemical composition, and mechanical properties. Automatic MIG welds were prepared in positions ranging from 0 to 35 degrees, up slope and down slope, using welding procedures closely approximating those used in the production of 2014-T6 aluminum alloy domes. Welds were nondestructively inspected, mechanically tested, and spectrographically analyzed. Variances in the welding position produced marked differences in porosity content and bead geometry but exerted no significant effect upon ultimate tensile properties. Minor differences in weld metal chemistry resulted from changes in the welding position. Dye-Penetrant and radiographic inspections disclosed that welds made in up-sloped positions contained fewer defects than those made in downhill directions. Welds made at up slopes of 15 to 30 degrees contained no internal or surface defects. Author