GALAGAR Smart 160 PFC Manual Técnico De Instrucciones página 32

SMART 160 PFC Pag. 32
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b) vertical welding
a) flat welding
Fig. 11-2 Posture in welding
3) Arc igniting
Arc igniting is the process for producing stable arc between electrode and workpiece in order to
heat them to implement welding. Common arc ignition mode includes scraping mode and
striking mode. (See Fig.11-3) During welding, touch the surface of the workpiece with the end of
the electrode by scraping or light striking to form short circuit, and then quickly lift the electrode
2~4mm away to ignite arc. If arc ignition fails, it is probably because there is coating at the end
of the electrode, which affects the electric conduction. In this case, the operator can strongly
knock the electrode to remove the insulation material until the metal surface of the core wire can
be seen.
a) striking mode b) scraping mode
Fig. 11-3 Arc ignition modes
4) Tack weld
For fixing the relative positions of the two pieces of weldment and welding conveniently,
30~40mm short weld joints are welded every certain distance in order to fix the relative positions
of the workpiece during welding assembly. This process is named as tack weld.