Use of the Amorphous Metals in the Steel Tubes Joinin

EPELBAUM, CARLOS; FONTANA, MARCELO; AUDEBERT, FERNANDO; AGUILERA, GUILLERMO; ARCONDO, BIBIANA

SOLDAGEM E INSPEçãO

Asociación Brasileña de Soldadura

Año: 2004 vol. 9 p. 69 - 73

0104-9224

Low carbon seamless steel tubes (DS 020) were welded through a Transient Liquid Phase Bonding process (TLPB), performed at constant temperature, employing Fe rich Fe-Si-B amorphous metals (25 mm thick) as interlayers. The tubes were aligned, with the polished butts of both pieces in contact with the amorphous layer, and located into the coil of an induction furnace under Ar flux. The temperature was raised at high rate up to the treatment temperature T (TL<T<TT, where TL is the melting temperature of the interlayer and TT is the melting temperature of the tubes material) which remained constant during a time t. The cooling rate was also contolled. During the isothermal process the Fe and other atoms from the materials of the tubes are disolved in the liquid region, whereas B and Si are disolved in the steel. The microstructure of the welded area allows to study the diffuion profile of the different elements.  The microhardness in the welding zone was also measured.  The welding processes were modeled and the results were discussed and compared to the experimental data.