Resumo

RODRIGUEZ FERNADEZ, JOHNNATAN  e  GIRALDO BARRADA, JORGE ENRIQUE. EFECT OF COPPER BACKING ON THE HEAT AFFECTED ZONE ON THE STEEL MIL A46100. Dyna rev.fac.nac.minas [online]. 2010, vol.77, n.162, pp.179-188. ISSN 0012-7353.

The effect of copper backing on the heat affected zone (HAZ) of a high - strength low - alloy steel (HSLA) was studied. Plates with 4,3 mm thicknesses were welded with the process SMAW in butt joint, electrodes E312 to diameter 1/8" were used. Two thickness of copper backing were employed: 3/8" (A) and 1/4" (B). Two welding positions were used: the first, flat position (10º tilt) and the second, vertical position (63º tilt) looking two heats input. It was found that the variation of the plate thickness does not reduce the HAZ's, however a reduction of approximately 2 mm of the HAZ and 3 mm of the welding pound were found compared with welding carried out with an electrode E312 to diameter 3/32" in two pass.

Palavras-chave : High - strength low - alloy steel (HSLA); HAZ; electrode E312; SMAW; copper backing.

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