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Most of the weld metals are suitable for service in either condition, but thespecification cannot cover all of the conditions thatsuchweld metals may encounter in fabrication and service. For this reason, the classifications require that the weld metals be produced and tested under certain specific conditions encountered in practice. Procedures employed in practice may require voltage, amperage, type of current, and travel speeds that are considerably different from those required in the specification.

The single-pass properties can be anything covered by the specifications. The slag system, arc characteristics, weld appearance, and polarity are not defined. 9. 10 T-7 Electrode Classification. Electrodes of the T-7 classification are self-shielded and operate on dc with negative polarity. The slag system is designed to give characteristics which allow the larger sizes of these electrodes to be used for high deposition rates and the smaller sizes to be used for all-position welding. The slag system is also designed to desulfurize the weld metal to a very low level, which helps make the weld deposit resistant to cracking.

Certain fluxes, generally considered to beneutral, tend to remove carbon and manganese to a limited extent and to replace these elements with silicon. With suchfluxes, a silicon-killed electrode is often not necessary though it may be used. Other fluxes add no silicon and may therefore require the use of a silicon-killed electrode for proper wetting and freedom from porosity. The flux manufacturer should be consulted for electrode recommendations suitable for a given flux. In welding single-pass fillets, especially on base metal that has scale, it is important that the flux, electrode, or both, provide sufficient deoxidation toavoid unacceptable porosity.

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