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Where cracks or splits pass through tight corners it may be difficult to use the normal speed welding nozzle. In such cases the technique of pendulum welding is effective.
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Prepare the crack in the normal way, then feed the welding rod manually into the 'V' groove, at an angle of between 80 and 90 degrees to the groove. Exert about 2.5 Kg downward force on the rod while playing the hot-air tool, fitted with standard nozzle 31A, onto the base of the rod and into the 'V' groove in a constant pendulum action. The bias of the action is determined by the comparative thicknesses of the component material and the welding rod.
Both must be in the same molten state at the point of fusion. Dressing and finishing is the same for speed welded material.
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