REHM TIGER 180 AC/DC ULTRA, Operating Instructions Manual

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Operation
43
6.6 Checks before switching on
It is preconditioned that

the system is properly placed in accordance with

Section 5
Commissioning ,

all connections (protective gas, torch connection) are properly made in
accordance with

Section 5, Commissioning ,

the scheduled periodic maintenance work has been performed in accordance
with Section 9, Maintenance,

the safety equipment and the system components (in particular the torch
connection hoses) have been checked by the operator, are functional and
ready for use,

the operator and the assisting persons are wearing the appropriate protective
clothing and the securing of the work area has been completed so that no
uninvolved persons are placed in danger.
6.7 Connecting the grounding cable
Warning!

Section 6.2, Electrical hazard. Ensure that the welding current cannot
flow through lifting device chains, crane cables or other electrical -
conductors.

Section 6.2, Electrical hazard. Ensure that grounding cables are
connected to the workpiece as close as possible to the welding site.
Grounding cables that are connected to distant points reduce the
effectiveness and increase the risk of electrical shock and vagrant
currents.
6.8 Practical instructions for use
The practical instructions for use listed below can only provide an overview of the
uses for REHM TIG welding systems. In the event of questions concerning
special welding tasks, materials, protective gases or welding fixtures refer to
topic-specific publications or specialist recommendations for manufacturers.
With TIG welding a differentiation is made between those materials that can be
welded using DC current and those materials that can be welded using AC
current. Besides non-alloy, alloy and high-alloy steel DC current can also be
used to weld copper, nickel, titanium and their alloys. AC current is generally
used to weld aluminium and its alloys.
Various types of tungsten electrodes are offered and used for TIG welding. The
difference between them is the share of doping elements in the tungsten
electrode. Their compositions are listed in DIN EN ISO 6848 (previously EN
26848) and usually consist of thorium oxide, cerium oxide, zirconium oxide or
lanthanum oxide. The advantages of oxide-containing tungsten electrodes are:
•
improved ignition properties
•
more stable arc
•
higher current carrying capacity
•
longer lifetime
Weldable materials
Tungsten
Electrodes