Scalable electric welding of utility model fill of starting to exchange fire

The utility model relates to a building welding technique field specifically is a scalable electric welding of utility model fill of starting to exchange fire, including aluminium foil box and softening spring, the softening spring sets up to four, has all cup jointed the magnetism device on two softening springs of setting on being located, the both ends of softening spring all set up futilely the style of calligraphy fixing base, the fixed block has all been welded at the both ends of softening spring, all run through setting up the screw hole on fixed block and the medial extremity of doingthe style of calligraphy fixing base, convenient operation, simple manufacture can change the bucket shape form of starting to exchange fire according to the different shapes welding of building -site, surrounds welding parts completely. When a welding top or the inconvenient couple in other positions are fixed when starting to exchange fire fill, the magnet of fighting of starting to exchange fire can adsorb in the comp