Welding Defects - REHM Synergic Betriebsanleitung

2.3 Controls on the rear panel
T- Gas hose fitting.
U- Switch.
Turns the machine on and off.
3 WELDING
3.1 Installation
Make sure that the wire diameter corresponds to the
diameter indicated on the wire feeder roller, and that
the selected program is compatible with the material
and type of gas. Use wire feeder rollers with a "U"-
shaped groove for aluminium wires, and with a "V"-
shaped groove for other wires.
Based on the type of wire to be used, make sure
that the cables corresponding to the torch and earth
clamp are properly connected to the terminal board
accessible from the door on the right-hand side of
the machine.
Normally, with wires that require gas protection, the
torch must be connected to the (+) pole.
3.1.1 Connecting the gas hose
The gas cylinder must be equipped with a pressure
regulator and flow gauge.
If the gas cylinder is placed on the cylinder shelf of
the trolley it must be fastened using the chain
provided.
Connect the gas hose leaving the rear of the
machine to the pressure regular, only after
positioning the cylinder. The gas flow must be
adjusted to approximately 8-10 litres per minute.
3.2 The machine is ready to weld
When using the PUSH-PULL P3KP torch, follow the
instructions enclosed.
• Connect the earth clam
• Set the switch U to I.
• Remove the gas nozzle.
• Unscrew the contact tip.
• Insert the wire in the wire liner of the torch, making
sure that it is inside the roller
roller is in the correct position.
• Press the torch trigger to m
until it comes out of the torch.
• Caution: keep your face away from t
assembly while the wire is coming out.
• Screw the contact tip back on, making sure that
the ho le diameter is the same as that of the wire
used.
• Assemble the gas nozzle.
3.3 Welding carbon steel
In order to weld these materials you must:
3.3.1 With gas protection
• Use a welding gas with a binary composition,
usually ARGON + CO
ranging from 75% up. With this blend,
bead will be well jointed and attractive.
Using pure CO as a protection gas will produce
2
narrow beads, with greater pe
considerably increase in splatters.
• Use a welding wire of the same quality as the
steel to be welded. It is best to always use good
quality wires, avoiding welding with rusted
that could cause welding defects.
• Avoid weldin g rusted parts or those with oil or
g rease stains.
3.3.2 Without gas protection
To achieve well connected and protected welds,
always work from left to right and top to bottom. The
flux-cored wires Ø 0,9 mu
c onnected to the (-) pole.
3 .4 Welding stainless steel
Series 300 stainless steels must be welded using a
protection gas with high Argon content, containing a
small percentage of O
(approximately 2%) to stabilize the arc.
Do not touch the wire with your hands. It is
important to keep the welding area clean at all
mes, to avoid contaminating the joint to be welded.
ti
3 .5 Welding aluminium
In order to weld aluminium you must u
• Pure Argon as the protection gas.
• A welding wire with a composi
the base material to be welded.
• Use mills and brushing machines specifically
designed for alum
other materials.
• In order to weld aluminiu
torch PUSH-PULL P3KP.

WELDING DEFECTS

4
1 DEFECT - Porosity (within or outside the bead) .
7
p to the workpiece.
groove and that the
ove the wire forward
he gun tube
with percentages of Argon
2
the welding
netration but a
st be used with the torch
or carbon d ioxide CO
2
se:
tion suitable for
inium, and never use them for
m you must use the
wires
2