Abstract
In the welding of low-carbon steel, various consumables may be employed such as tube wire and solid wire. This work compares the deposition rate and deposition efficiency as a function of welding current, distance between contact tip and workpiece (CTWD) and type of shielding gas, comparing ER70S-6 and E71T-1C. The deposition rates were measured using a succession of weld beads on steel plate. The frequencies of drop detachment were measured by means of data acquisition equipment, on the basis of the variations of arc voltage. Drop diameter was calculated theoretically based on the wire feed speed. Software was used for statistical analysis of the experimental results. The results showed that the deposition rate increases with increase in current and with the increase in CTWD. Similarly, the most important variable for controlling deposition efficiency was the nature of the consumable. ER70S-6 displayed a higher deposition efficiency than E71T-1C tube wire, as was expected, since the tube wire produces slag, which does not count towards the weight of the deposited bead.
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