A flux-cored wire for different-material bonding which, when used for bonding an aluminum-based material to an iron-based material, heightens the bonding strength and has satisfactory welding efficiency; a method of bonding different materials; and a joint obtained by the method. In particular, the method is for use in the fusion welding of a high-tension steel material to a 6000-series aluminum alloy material, which are high-strength different materials, and in the bonding of a zinc-plated steel material. One embodiment employs a flux-cored wire comprising an aluminum sheath and a flux with which the inside of the sheath is filled, wherein the flux is a fluoride composition containing a specific amount of AlF3 and containing no chloride and the sheath comprises an aluminum alloy containing 1-13 mass% silicon. Use of such flux-cored wire in the fusion welding of a high-tension steel material to a 6000-series aluminum alloy material, which are high-strength different materials, gives a high bonding strength.

Flux-cored wire for different-material bonding and method of bonding different materials

A heat exchanger core having a tube of aluminum material and heat transfer fins of aluminum material joined to each other with a brazing filler, which has at least part of the surface thereof coated with an inorganic sintered layer incorporating therein a pigment-containing phase of the two complexes of potassium hexafluoroaluminate and potassium tetrafluoroaluminate.

Heat exchanger core

The repair of cracks according to the state of the art comprises the fact that defects located on the inside must be worked outward in order to be able to be welded closed. The method according to the invention proposes not to work out cracks located on the inside, but to melt the crack located on the inside utilizing a flux agent.

Welded Repair of Defects Lying on the Inside of Components

A highly basic particle flux for submerged arc welding that produces less than ml/100 gr of diffusible hydrogen in the weld metal, which flux comprises a carbon dioxide containing compound with an effective amount of heat releasable carbon dioxide in the range of 0.5-3.5% by weight of the flux over 10% by weight of a low melting point compound and a binder.

Submerged arc flux

The invention relates to an electroslag surfacing of cylindrical components, such as a rolling-mill roll for iron production. The invention seeks to solve the problems of the electrodes for supplying a high current to the slag, and; how to prevent excess fusion-penetration of the base metal from occurring during the thick surfacing which results in an increase in heat input and a decrease in welding speed or the speed of rising the metal pool. In the present invention, a multi-phase alternating current is supplied to the slag via a plurality of consumable electrodes each in the form of a bar having a large cross section, and further the surfacing is conducted while rotating the workpiece and continuously adding molten metal to the surface of the slag bath. The invention can be mainly utilized for the production and repairing of cylindrical composite components.

Method of electroslag surfacing of components having a cylindrical surface

A welding process for joining aluminum materials in a horizontal welding position, without preheating, this process being highly economical and characterized by minimal environmental pollution, good strength and toughness of the welded joint, in which process the arc, as in submerged arc welding of steel plates, is covered by a flux layer and burns in a closed cavity, this process being realized by the use of a flux having a flux composition of 20-70% potassium chloride (KCl), 20-70% of an alkaline earth metal chloride, preferably calcium chloride and/or magnesium chloride (CaCl 2 and/or MgCl 2 ), 1-20% of calcium fluoride (CaF 2 ) and preferably 1-15% of a substance capable of lowering the melting point and/or releasing gas.

Process for the submerged-arc welding of light metals such as aluminum and aluminum alloys

A method of and apparatus for welding sheet steel panels by submerged arc welding is described. By providing one or, depending on the thickness of the sheet steel panels, more than one pair of closely spaced wire electrodes in the weld gap with the simultaneous introduction of additional filler metal carrying no current, preferably in the form of a metal powder, disadvantages associated with known methods may be avoided.

Method of and apparatus for welding sheet steel panels

Verfahren und vorrichtung zum elektro-schlacke-schweissen von stahlblechen

In an apparatus for electroslag welding of steel sheets with the aid of at least one wire electrode pair, a welding gap defined between the electrodes of the electrode pair, current-carrying conduits for the electrode pair, and a supply tube for supplying metal in a powdered state, and welding flux into the welding gap, the improvement includes a shielding device creating a duct along the current-carrying conduits. The duct, owing to the shielding device, is substantially free of any magnetic field, and the supply tube is positioned in the duct.

Apparatus for welding steel sheets

of EP00017711. Devise for carrying out the process of electro-slag or electro-gas welding of metal sheets in which powdered additional materials are introduced through tubes into the welding gap and supply nozzles are fixed on to pairs of current leads for the electrodes, characterised in that the pairs of current leads (3) have a magnetic screening on which the tubes (11) are fixed in the low-field space.

Peter Hirsch

Papers

Process for the submerged-arc welding of light metals such as aluminum and aluminum alloys

Method of and apparatus for welding sheet steel panels

Verfahren und vorrichtung zum elektro-schlacke-schweissen von stahlblechen

Apparatus for welding steel sheets

Apparatus for carrying out the process of electro-slag or electro-gas welding of metal plates