Daihen Welbee WB-A350P, Owner'S Manual

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5-3
Chapter 5 W
elding Operation
C
HECK BEFORE
W
ELDING
W
ELDING
O
PERATION
C
HAPTER
5
5.1.4 Precautions for high-frequency wave
Observe the following safety measures to avoid the electromagnetic interference:
5.2 Check before Welding
This section explains the check parameters before welding. To avoid welding problems beforehand,
check the parameters below when the welding environments are prepared. (These are the check
parameters recommended by OTC. They also contain check parameters after power ON or after shield
gas supply.)
For handling the cooling water circulation device, refer to the instruction manual of the cooling water
circulation device. (When using the water-cooled welding torch)
• Note that the following facilities or equipment nearby may cause high-frequency wave
to invade and cause electromagnetic interferences:
Input cable, signal cable, phone cable;
Radio, television;
Computers and other control unit;
Industrial detector and safety equipment;
• Make the welding cables as short as possible.
• Run the welding cable as close to the floor or the ground as possible.
• The cable for base metal side and the cable for electrode side should be aligned with
each other.
• Do not share the earth connections of the base metal and the welding power source
with those of other machines.
• Close all the doors and covers of the welding power source and securely fix them not to
come loose for use.
• If electromagnetic interference has occurred, follow the steps above as well as the
safety measures described in "3.2.2 Electromagnetic interference".
Check parameter Countermeasures Check
1
There should be no loose connections of the
cables.
Use a proper tool to ensure connection.
2
There should be no dirt such as oil or
spatter adhering on the connection
terminals or connection part of cables.
Wipe off dirt so that the metal face of connection terminal or connection
part is fully exposed. Using a metal brush is effective.
3
The contact part of jig and welding work
piece should not be painted.
Painted contact part could cause increased contact resistance,
resulting in decrease in arc voltage. Polish the painted contact part
using a grinder to expose the metal face.
4
The contact part of jig and welding work
piece should be free from unevenness due
to influence of burn through, spatter, or
aging deterioration.
Polish the surface of the jig using a grinder so that the welding
workpiece and the jig can fully contact each other.
5
The flow rate of shield gas should be
adequate.
Set the flow rate of the shield gas adequately.
6 Tungsten electrode tip condition Grind the electrode tip as necessary.
7 Tungsten electrode diameter is appropriate
Use a tungsten electrode with a diameter corresponding to the welding
current.