Welding; theory, practice, apparatus and tests, electric, thermit and hot-flame processes . Fig. II.—Operator welding with Bernardos arc process. pole. The negative pole is a carbon pencil. The current usedis direct, of 100 to 300 volts, and 600 to 1000 amperes. Themetal to be welded lies on a metal table to which the positive poleis clamped. The carbon negative is placed in contact with themetal and the current is thrown on. The carbon pole is then THE BERNARDOS ARC-WELDING PROCESS 37 withdrawn 2 to 4 Inches, and an arc is sprung, which follows thecarbon wherever the carbon is manipulated by
Welding; theory, practice, apparatus and tests, electric, thermit and hot-flame processes . Fig. II.—Operator welding with Bernardos arc process. pole. The negative pole is a carbon pencil. The current usedis direct, of 100 to 300 volts, and 600 to 1000 amperes. Themetal to be welded lies on a metal table to which the positive poleis clamped. The carbon negative is placed in contact with themetal and the current is thrown on. The carbon pole is then THE BERNARDOS ARC-WELDING PROCESS 37 withdrawn 2 to 4 Inches, and an arc is sprung, which follows thecarbon wherever the carbon is manipulated by the operator. Thegreater part of the heat of the arc, about 3500 deg. Cent., is gener-ated in the metal or is reflected back on the metal from the apparatus used is as follows:. Fig. 12.—Operator welding with Bernardos arc process. (Courtesy proceedingsof the Engineering Society of western Pennsylvania, May, 1909, C. B. Anel.) 1. Generator of direct current of 100-300 volts and 600-ionoamperes. 2. A metal table on which to place the work. 3. Leads, switches, and controlling apparatus for the current,carbon pencil. 38 WELDING 4. Protective apparatus for the workman. Apparatus and Current.—The Generator.—It is claimedby the advocates of this system that good results cannot be ob-tained unless current of ample volume and pressure be from power wires is generally inadequate. It is bestto have a special dynamo of not less than 75 to 100 kw. Forreasons given below, the current should be direct. Where thecurrent supplied is alternating, a direct-coupled motor-genera-tor is used to transform to direct current. The motor-generator Shunt Field?with Rheostat
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