Aluminum welding alloys with improved welding performance are disclosed. The aluminum welding alloys include high loading levels of magnesium and one or more surface active elements and arc stabilizer elements. Methods of making and using the aluminum welding alloys are further disclosed.

An aluminum alloy clad material includes a core material, one side being clad with cladding material 1, the other side being clad with cladding material 2, the core material including an aluminum alloy that includes 0.5 to 1.8% of Mn, and limited to 0.05% or less of Cu, with the balance being Al and unavoidable impurities, the cladding material 1 including an aluminum alloy that includes 3 to 10% of Si, and 1 to 10% of Zn, with the balance being Al and unavoidable impurities, and the cladding material 2 including an aluminum alloy that includes 3 to 13% of Si, and limited to 0.05% or less of Cu, with the balance being Al and unavoidable impurities, wherein the Si content X (%) in the cladding material 1 and the Si content Y (%) in the cladding material 2 satisfy the value (YX) is 1.5 to 9%.

Use of an aluminium composite material in a thermal joining method, said material consisting of at least one aluminium core alloy and at least one external brazing layer consisting of an aluminium brazing alloy provided on one or both sides of the aluminium core alloy, wherein the aluminium brazing layer has a pickled surface. Reduced costs and a lower environmental impact is achieved by using an aluminium composite material in which the pickled surface of the aluminium brazing layer had been pickled by pickling with an acid, aqueous pickling solution containing at least one mineral acid and at least one complex-forming agent or a complexing mineral acid, wherein the removal of material in the pickling is between 0.05 g/m.sup.2 and 6 g/m.sup.2, the aluminium composite material is used in a flux-free, thermal joining method, and the joining method is carried out in the presence of a protective gas.

Aluminum-Iron-Zirconium alloys that exhibit improved electrical and mechanical properties.

The present disclosure relates generally to the field of welding filler metals, and more particularly to compositions suitable for welding or brazing aluminum alloys. In an embodiment, an aluminum-silicon-magnesium alloy, includes a magnesium content between approximately 0.1 wt % and approximately 0.5 wt %, wherein substantially all of the magnesium content is present as magnesium silicide. The alloy includes a silicon content between approximately 5.0 wt % and approximately 6.0 wt %, wherein at least 4.75 wt % of the silicon content is present as free silicon. The alloy includes one or more of iron, copper, manganese, zinc, and titanium. The alloy further includes a remainder of aluminum and trace components.

A brazing sheet is provided for use in brazing performed in an inert gas atmosphere both using flux and without using flux. The brazing sheet includes an aluminum-based core, an intermediate material layered on the core and being composed of an aluminum alloy that contains Mg: 0.40-3.0 mass %, and a filler metal layered on the intermediate material and being composed of an aluminum alloy that contains Si: 6.0-13.0 mass % and Mg: less than 0.050 mass %. The brazing sheet satisfies the formula below where M [mass %] is the Mg content in the intermediate material, ti [m] is the thickness of the intermediate material, and tf [m] is the thickness of the filler metal:
tf10.15ln(Mti)+3.7.

Brazing sheet having a core layer made of a first aluminium alloy, attached to one side of said core layer a sacrificial cladding made of a second aluminium alloy, and attached to the other side of said core layer a braze cladding made of a third aluminium alloy. The first aluminium alloy consists of: Si 0.6 wt %; Fe 0.7 wt %; Cu 0.4-0.9 wt %; Mn 1.0-1.6 wt %; Mg 0.2 wt %; Cr 0.05-0.15 wt %; Zr 0.05-0.15 wt %; Ti 0.05-0.15 wt %; other elements 0.05 wt % each and 0.2 wt % total; Al balance up to 100 wt %; the second aluminium alloy consists of: Si 0.65-1.0 wt %; Fe 0.4 wt %; Cu 0.05 wt %; Mn 1.4-1.8 wt %; Zn 1.5-4.0 wt %; Zr 0.05-0.20 wt %; other elements 0.05 wt % each and 0.2 wt % total; Al balance up to 100 wt %. The third aluminium alloy has a melting point lower than said first and second aluminium alloys.

A method of making a semiconductor including soldering a conductor to an aluminum metallization is disclosed. In one example, the method includes substituting an aluminum oxide layer on the aluminum metallization by a substitute metal oxide layer or a substitute metal alloy oxide layer. Then, substitute metal oxides in the substitute metal oxide layer or the substitute metal alloy oxide layer are at least partly reduced. The conductor is soldered to the aluminum metallization using a solder material.

A method of making a semiconductor including soldering a conductor to an aluminum metallization is disclosed. In one example, the method includes substituting an aluminum oxide layer on the aluminum metallization by a substitute metal oxide layer or a substitute metal alloy oxide layer. Then, substitute metal oxides in the substitute metal oxide layer or the substitute metal alloy oxide layer are at least partly reduced. The conductor is soldered to the aluminum metallization using a solder material.

An aluminum foil having a high adhesiveness to solder and containing at least one of Sn and Bi, in which a ratio of a total mass of Sn and Bi to a total mass of the aluminum foil is 0.0075 mass % or more and 15 mass % or less.