Welding Consumables

TIG

Show more

TIG HW

Tungsten inert-gas hot-wire welding  (TIG HW)

 
Like the TIG process, the TIG HW process also delivers high quality welds in weld cladding and joint welds. The TIG arc is used to melt the parent material while a wire feed system continuously transports the filler material to the arc/molten pool. The filler wire – usually 0.8–1.2 mm (0.0315–0.047) in diameter – is connected to a dedicated power source via a contact tube and is thus preheated through conductive heating.
 
One factor that is of fundamental importance for an optimal TIG HW weld is the angle of attack of the contact tube. This should ideally be at an inclination of 20°–40° to the work piece/the horizontal. The length of the free wire end should not exceed 15 mm (0.591 in) at a weld wire diameter of 0.8 mm (0.0315 in) as the wire otherwise can flash off due to resistance heating before being dipped in the molten pool.
 
Technical prerequisites
  • A power source (direct current)
  • Tungsten electrodes (preferably thorium-free), negative polarity
  • Shielding gas: argon or argon with a hydrogen content of up to max. 5 %
  • A power source (alternating current) for heating the hot wire.

To prevent oxidation of the hot wire, the contact tube can be equipped with a shielding gas supply. The welding speed is between approx. 25–40 cm (9.84–15.7 in), possibly higher depending on the conditions.

The weld result is particularly favorable thanks to the increased output, reduced warpage, narrower heat-affected zones, better join, lower risk of hot cracking and lower dilution with the parent material.

PAW

Show more

MIG/MAG

Show more

MAG tandem

Show more

SAW

Show more