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Continued from page 72 MAX ARC LTD.
Page 77
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Walton-on-Thames, Surrey.
ONLY a.c. arc welding equipment is made by this company, the latest model to be introduced being the Unicus. This is an economically priced unit ideal for light work or for a workshop where only a little welding is carried out. Output is fixed at 65 amp and the Unicus operates from ral-v mains. As well as the electric welding of steel, the machine is suitable for brazing and soft soldering with special accessories that are available.
For more serious welding there is the Max Arel-tte, which has an output of from 25 to 180 amp., there being 22 current settings obtained by inserting a centre power plug and the electrode holder plug in pairs of numbered sockqs in particular combinations. The machine is designed for continuous welding duty and has an average demand on the mains of about 12 amp. at 400/440 V and 20 amp. at 200/250 V. The continuous-load rating is 3 kVa and a condenser can be built into the unit which will reduce the demand on the mains. The Max Arclette is a mobile unit—mounted on three wheels—and overall dimensions are I ft. 7 in. by 1 ft. 11 in. by 2 ft. 3m.
At the top end of the scale for vehicleworkshop use there is the 0 range, of which there are five oil-cooled versions with current outputs of from 29 to 200 up to 25 to 450 amp. and two air-cooled units with outputs of 20 to 250 amp.
Sets of 300-amp. output and above have 80 and 100 V striking the arc, whilst the smaller sets have 50 and 80 V. The range was actually introduced about three years ago and there are no change-over links, chokes or switches for the current control. The transformer is designed so that a 0.5-in, variation in the gap of the core provides stepless adjustment of the welding current over the complete range; this means a considerable reduction in losses with all the power concentrated in the arc,