GB1397682A - Radiator - Google Patents

Abstract

1397682 Welding by fusion; making heat exchangers KELLER & KNAPPICH AUGSBURG ZWEIGNIEDERLASSUNG DER INDUSTRIE - WERKE KARLSRUHE AUGSBURG AG 28 Feb 1973 [29 March 1972] 9858/73 Headings B3R and B3A In a radiator comprising radiator elements a, b each comprising two welded together halfshells 1, wherein the elements a, b are jointed together at the abutment of aperture-surrounding bosses 4 of the half-shells, said abutting bosses have inwardly directed flanges 6 of the same diameter and said boss abutment joint is effected by internal, rotary, gas-shielded, consumable electrode wire, arc welding to produce an internal bead 7 extending equally on to the two flanges 6. The latter may be cylindrical, as shown, coned inwardly or outwardly, or, Fig. 6 (not shown), bent back so as to be radial. The flange width is at least treble the flange thickness. The welding machine shown comprises two rotatable cylindrical heads 8 through mutually inclined ports of which electrode wire 12 and shielding gas 14 are outwardly fed. Wire is vertically fed to each head, by a motor 17 rotating with the head, from a separately mounted freely rotatable or stationary reel or, as shown, a reel 18 rotating with the head. The latter is rotated by a motor 15. The welding is effected by a head rotation of at least 360 degrees. The heads may be water cooled. The heads may be moved axially slightly during rotation for seam widening. The radiator elements may be aligned with the heads by location on adjusting pins 19 mounted on a base-plate 16. The radiator elements may be pressed together by a screw actuated member 22. In alternative embodiments, a welding head may nutate or, for welding through a constricted hole in an end element, may execute an eccentric rotation.