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 solder scattering is prevented at the time of reflow and the oxide films formed on the surfaces of solder or electrodes are thoroughly removed. The soldering method according to the present invention contains the steps of: applying solder paste to the electrode on a printed circuit board and mounting an electronic part on the solder paste, volatilizing the residue-free flux contained in the solder paste by heating the printed circuit board in a chamber set to be a vacuum state and approximately 180 degree C. at the time of pre-heating (interval A), removing oxide films formed on the electrode and the like by heating the printed circuit board in the chamber set to be a formic acid atmospheric state and the temperature of approximately 200 degree C. at the time of reducing (interval B), and melting solder powder contained in the solder paste by heating the printed circuit board in the chamber set to be a vacuum state and the temperature of 250 degree C. at the time of main heating (interval C).

A solder scattering is prevented at the time of reflow and the oxide films formed on the surfaces of solder or electrodes are thoroughly removed. The soldering method according to the present invention contains the steps of: applying solder paste to the electrode on a printed circuit board and mounting an electronic part on the solder paste, volatilizing the residue-free flux contained in the solder paste by heating the printed circuit board in a chamber set to be a vacuum state and approximately 180 degree C. at the time of pre-heating (interval A), removing oxide films formed on the electrode and the like by heating the printed circuit board in the chamber set to be a formic acid atmospheric state and the temperature of approximately 200 degree C. at the time of reducing (interval B), and melting solder powder contained in the solder paste by heating the printed circuit board in the chamber set to be a vacuum state and the temperature of 250 degree C. at the time of main heating (interval C).

The present disclosure relates to a welding composition for joining high manganese steel base metals and methods of applying the same. The composition includes: carbon in a range of about 0.4 wt % to about 0.8 wt %; manganese in a range of about 18 wt % to about 24 wt %; chromium in an amount of about 6 wt %; molybdenum in an amount of about 4 wt %; nickel in an amount of about 5 wt %; silicon in an amount of about 0.4 wt % to about 1.0 wt %; sulfur in an amount of about 200 ppm; phosphorus in an amount of about 200 ppm; and a balance including iron. In an embodiment, the composition has an austenitic phase.

A welded steel part with a very high mechanical strength is provided. The welded steel part is obtained by heating followed by hot forming, then cooling of at least one welded blank obtained by butt welding of at least one first and one second sheet. The at least one first and second sheets including, at least in part, a steel substrate and a pre-coating which includes an intermetallic alloy layer in contact with the steel substrate, topped by a metal alloy layer of aluminum or aluminum-based alloy. A method for the fabrication of a welded steel part and the fabrication of structural or safety parts for automotive vehicles are also provided.

A method for joining a first part formed of an aluminum material to a second part formed of a steel material by metal inert gas welding and cold metal transfer is provided. An aluminum filler material forms a fillet joint between the parts and provides a structure for automotive body applications, such an aluminum bumper extrusion joined to a steel crush box connection. The first part includes a notch for hiding the start and end of the joint. A transition plate formed of a mixture of aluminum material and steel material can be disposed between the first part and the second part to provide the notch. The second part can include a mechanical fastener further joining the parts together. In another embodiment, the second part includes a plurality of dimples and is welded to the first part along the dimples.

A method for joining a first part formed of an aluminum material to a second part formed of a steel material by metal inert gas welding and cold metal transfer is provided. An aluminum filler material forms a fillet joint between the parts and provides a structure for automotive body applications, such an aluminum bumper extrusion joined to a steel crush box connection. The first part includes a notch for hiding the start and end of the joint. A transition plate formed of a mixture of aluminum material and steel material can be disposed between the first part and the second part to provide the notch. The second part can include a mechanical fastener further joining the parts together. In another embodiment, the second part includes a plurality of dimples and is welded to the first part along the dimples.

Provided is a flux-cored wire with excellent welding workability, AW performance, and SR performance that can use both 100% CO.sub.2 gas and ArCO.sub.2 mixed gas as the shield gas in an initial layer welding for a structure body, particularly, a pipeline. The flux-cored wire with a flux filled into a steel outer sheath, includes, relative to the total mass of the wire: Mn: 1.5 to 3.1% by mass; Ni: 0.2% or more by mass and less than 1.00% by mass; at least one kind of Si, a Si alloy, and a Si oxide: 0.3 to 1.0% by mass in terms of Si; Ti: 0.05 to 0.29% by mass; C: 0.06 to 0.30% by mass; at least one kind of B, a B alloy, and a B oxide: 0.0030 to 0.0090% by mass in terms of B; and Fe: 91 to 97% by mass.

Provided is a flux-cored wire with excellent welding workability, AW performance, and SR performance that can use both 100% CO.sub.2 gas and ArCO.sub.2 mixed gas as the shield gas in an initial layer welding for a structure body, particularly, a pipeline. The flux-cored wire with a flux filled into a steel outer sheath, includes, relative to the total mass of the wire: Mn: 1.5 to 3.1% by mass; Ni: 0.2% or more by mass and less than 1.00% by mass; at least one kind of Si, a Si alloy, and a Si oxide: 0.3 to 1.0% by mass in terms of Si; Ti: 0.05 to 0.29% by mass; C: 0.06 to 0.30% by mass; at least one kind of B, a B alloy, and a B oxide: 0.0030 to 0.0090% by mass in terms of B; and Fe: 91 to 97% by mass.

A method of cleaning a workpiece after a welding process is provided, wherein the cleaning is conducted by removing oxide from the surface of the workpiece which is formed on the weld and the heat-affected zone of the workpiece during the previous welding process, wherein an electric arc is generated between the workpiece and a non-consumable electrode to remove the oxide on the workpiece, wherein a power source is provided to electrically communicate the workpiece and the non-consumable electrode and wherein the non-consumable electrode is anodic connected and the workpiece is cathodic connected.