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There are two types of porter-cable electric arc furnaces, acid or basic, which refer to the type of slag present in the furnace. Both types power are lined with a combination of brick and refractory. Practically every advance in foundry melt shop practices has put greater demands on the brick and refractory used. Higher operating temperatures and other desirable conditions, which are increasingly destructive to refractory materials, are called for by the plant operators. Over the past ten to fifteen years, a lot of expertise in the iron and steel foundry has been lost. Therefore, it would serve the industry well if some fundamentals of brick and refractory applications are reviewed here.

5. Joint design and material thickness. Some electrodes create an arc that penetrates deeply, performing well on thick sections with narrow grooves or no bevel. Poor fit-up calls for electrodes that can bridge wide gaps.6. Efficiency. Meeting all other conditions, engineers select the electrode that gives highest deposition rate. For heavy-section joints, use powder-metal-addition fillers.Designating electrodes for carbon and low-alloy steels, following the prefix E'', to signify a SMAW electrode, come two or three digits to indicate minimum tensile strength in 1,000 PSI units; a digit indicating usable current and electrode-coating type; and, in some cases, a hyphen followed by a letter and number suffix to denote weld metal composition. Example: E7010-A1 is a SMAW electrode (E), of 70,000-psi tensile strength (70), for use in all welding positions (1), having a high-cellulose-sodium coating tin use with DCEP (0). -A1 indicates a particular composition listed in the A5 specification. A-1 suffix, as in 7018-1, indicates high impact toughness at a temperature lower than specified for a standard E7018 electrode.

Regular readers of this column will remember that one of my long-standing concerns with most commercial kitchen equipment is its inability to survive heavy cleaning sessions with pressure washers, hoses and the like.Too few manufacturers consider that to be enough of an issue to make changes in equipment to accommodate the types of cleaning methods used today. In one of my missives to a senior executive of one of the larger manufacturers, I begged him to go and observe what went on inside a commercial kitchen at 1 a.m. when it was time for the cleaners to do their job.