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156 
PORTABLE WELDERS LTD.
Page 78
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Central Avenue, Denbigh Road, Bletchley, Bucks. THIS concern markets a complete range 1 of portable spot-welding guns, both for repair and production work, and a portable arc-welding transformer is also available. Particularly applicable to the vehicle repairer is the S.15 4-8 kVa gun with the Mark III B weld control, which is sold as a repair kit complete with four pairs of electrode arms packed in a steel case. it is usable on general body repair work on 20-, 18and 16-s.w.g. mild-steel sheet. For more continuous work, such as on production, a 15-kVa gun is available, either hand or pneumatically operated. The hand version of the gun is the S.120. which is designed for use with the Mark IV C weld control and has water-cooled electrode arms. For highspeed automatic work the S.126 is marketed When coupled to the Mark X BH four-stage combined weld and heat control, this gun is capable of up to 2,500 welds per hour on light-gauge material. Just being put into production by Portable Welders is an ac. arc welder, the Fararc Series IV, which weighs less than 100 lb. yet has a continuous rating of 200 amp. The set has a dual-wound primary for connection to 240 V or 415 V supply and a dual-wound variable secondary giving 50 to 180 amp. • at 100 V output and 110 to 250 amp. at 50 V output. The welding set has glass-silicone insulation and is cooled by a fan. It is designed particularly for maintenance and site jobs where power combined with light weight is required.