Disadvantages of Flash Welding -
(i) The most undesirable feature of flash welding is the flashing operation during which it is impossible to protect the welding machine and the surrounding area from these particles, which can burn into slide way bearings, insulation etc. This necessitates more frequent maintenance.
(ii) The process presents a considerable fire hazard. Operators need be protected from flying particles.
(iii) Concentricity and straightness of workpieces during welding is often difficult to maintain.
(iv) Metal is lost during flashing and upsetting.
(v) Shape of the workpieces to be flash welded should be similar.
(vi) It is generally not recommended for welding zinc and its alloys, cast iron, lead and its alloys.
