An Important Advance in Welding Science
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ANEW welding process for cast iron has been evolved by Barimar, Ltd., 18, Lamb's Conduit Street, London, W.C.1. Claimed to give perfect amalgamation and fusion at only half t the temperaturehitherto required, it marks a definite step in the progress of welding. Of particular value where castings of elaborate and intricate formation have to be repaired, the new process almost eliminates the risk of distortion caused by uneven heating.
It has been made possible by the development of a special new cast-iron alloy for the material of which the welding sticks are composed, and a new anti-oxide flux which are used in con
junction with a changed manner of application of the blow-pipe flame—the last-named being of considerably smaller dimensions, with consequent saving of gas, than in the past.
Welding can be carried out without previous heating of the work, except for a brief local warming-up of the part to be treated, with the result that, in many cases, the damaged unit need not be fully dismantled.
The welding metal has a close-grained structure, and although said to possess excellent wearing qualities and a high degree of resistance to corrosion, attack by hot gases, and impact, it can easily be machined or worked with a ble. Fur
thermore, we understand that the repaired part is stronger than the original and that malleable metal, as well as cast iron can be welded by this new Barimar process, We recently witnessed a repair being executed at the Barimar works to a cracked cylinder block of large dimensions, and were impressed not only by the ease and expedition with which the work was carried out, but also by the remarkably moderate temperature of the casting immediately afterwards, it being possible to bear the hand upon the metal without the least discomfort within an inch or two of the part that had just been welded.