Vertical down welding of all common corrosion resistant CrNiMo and CrNi steels (as AISI 304, 304L, 316, 316L, Wn° 1.4301, 1.4306, 1.4550, 1.4401, 1.4404).
Vertical down welding can be performed much more rapidly, which will shorten the production time. Also the heat-input in the material is much lower, which has a favourable influence on tensions and distortion in light gauge metal. It will also limit the postweld cleaning work to a minimum (surface discoloration is much smaller, so less pickling is required).
Lastek 805 has a stable arc, gives almost no spatters and the welding beads have a smooth appearance.
It permits easy root pass welding of open joints in stainless steel.
Chemical and petrochemical industry, food industry, hospitals, pharmaceutical industry, industrial kitchen installations, sea transport.
If danger from corrosion by nitric acid is a problem it is desirable to use Lastek 800 or 803.
For the root pass in an open joint and the first pass in a corner joint, it is preferable to weld with the electrode on the negative pole when using direct current.
Weld with a short arc at high speed, use the lowest amperage possible.
Use only dry electrodes.
Use a stainless steel brush and chipping hammer.
