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condition with low requirement on dust removal; grinding wheel can be used for condition with high requirement
on dust removal.
2) Posture in operating
Take flat welding of butt joint and T-shaped joint from left to right as an example. (See Fig. 13.2) The operator
should stand at the right side of the working direction of weld joint with mask in the left hand and electrode
holder in the right hand. The left elbow of the operator should be put on his left knee to prevent his upper body
from following downwards, and his arm should be separated from the costal part so as to stretch out freely.
`
a) flat welding
b) vertical 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.13.3) 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
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.
Summary of Contents for TIG315PACDC(E202)
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