BOHLER FCAW & GMAW WIRE
Flux cored arc welding (FCAW)
Böhler Welding offers the most comprehensive portfolio of cored wires in the world. Producing both folded and seamless cored wires, Böhler Welding is the best source for all types of cored wires across all alloy groups.
Rutile folded wires provide a powerful penetrating arc with high deposition characteristics, while depositing a smooth weld with minimum spatter formation. Seamless rutile and basic wires offer high impact toughness at low temperature and the lowest possible hydrogen levels in the pure weld metal. Metal-cored wires facilitate maximum productivity, which is unsurpassed when used in robotic applications.
For high-alloyed base materials, precise alloy adjustments ensure high quality welds with excellent mechanical properties and corrosion resistance. Our state-of-the-art production technology and internal quality control -exceeding the high standards of the DIN EN ISO 9001 quality system – ensure outstanding and consistent product quality to our customers and partners – every time.
Main features and benefits of cored wires include:
- Excellent mechanical properties and corrosion resistance of all weld metal
- Moisture pick-up resistance for seamless wires
- Reliable and consistent weld quality
- Smooth welding characteristics
- Lack of or minimum spatter formation
- Minimum post weld cleaning
- Increased productivity
- Reduction of total welding costs
Gas metal arc welding (GMAW) – Metal inert gas (MIG) and metal active gas (MAG) welding
GMAW or MIG/MAG is a semi-automatic process in which a metal arc burns between a current carrying wire electrode and the workpiece, protected by a shielding gas . The wire is fed mechanically into the arc by a wire drive unit with rollers.
Argon, helium or mixtures of these inert gases are used as shielding gas in the MIG process. Shielding gases of argon with the addition of oxygen, helium with the addition of oxygen, carbon dioxide (CO2) or mixtures of these gases are used in the MAG process. The shielding gas promotes the creation of a stable arc and protects the molten weld pool from coming into contact with the atmospheric air. The addition of oxygen to the shielding gases reduces the surface tension of the weld pool and leads to the formation of a flatter weld surface with good wetting onto the weld edges. The transfer of metal in the arc also becomes finer.
Excessive alloying of the wire electrodes equalizes the burn-off of alloying elements which occurs. It is imperative that the welding area is free from draughts. At high welding speeds and rapid oscillation, care must be taken to ensure complete shielding of the molten weld pool by using appropriate quantities of shielding gas and correct nozzle shapes.
Only direct current inverters or rectifiers are suited as as power sources, with the positive pole mainly on the electrode. Although welding with the negative pole increases the metal deposition efficiency, droplet transfer is higher and the arc less steady. Welding can be in the spray-arc or short arc mode, depending on welding current and arc voltage.