Silverline 250A Arc Welder - Manual (Page 7)

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• That the cables are undamaged and that there is nothing causing a short circuit
• That all circuit connections are correct. You should pay particular attention
to the work clamp, making sure that it is correctly attached to the workpiece
and that there is no grease, paint or other contaminate that could cause a bad
connection
Maintenance
Cleaning
• Disconnect the machine from the mains supply before cleaning
• Keep your machine clean. Always clean dust or particles away, and never allow
ventilation holes to become blocked. Use a soft brush, or dry cloth to clean
the machine, if available blow through the ventilation holes with clean, dry,
compressed air
Disposal
• Do not dispose of power tools, or other waste electrical and electronic
equipment, with household waste.
• Contact your local waste disposal authority for information on the correct way
to dispose of tools
Duty Cycle
• This machine is not designed to weld constantly. Excessive continuous welding
would cause overheating and damage to internal components
• The duty cycle (see specifications) defines the number of minutes, in every ten
minutes, that the machine can weld
• For a duty cycle of 30%, the machine may be used for 3 minutes, then must be
allowed 7 minutes to cool
• If the duty cycle is exceeded, the machine will automatically cut-out
• Using the machine at reduced current settings, and maintaining good ventilation
will maximise the duty cycle
Thermal Cut-out
• This machine is equipped with a thermal cut-out. If the machine is overloaded,
or used beyond its duty cycle, it will automatically shut down
• Allow the machine to cool. The cut-out will automatically reset once the
machine is ready to be used
Preparing to weld
• Ensure that parts to be joined are clean, and free from rust, paint, or other
finishes
• All parts should be well supported, so that there is a gap of approximately 1mm
where you intend to form the welded joint
• Check that there are no flammable materials in the vicinity of the work area
• Attach the Earth Clamp (5) to a cleaned area of one of the parts, as near as
practical to where the joint will be
• Squeeze the Electrode Clamp (4), to open the jaws. Place an electrode into
the jaws, and release. The electrode should be firmly gripped, with the clamp
contacting the clean metal part (not the coated part)
• Ensure that there is both a responsible person, and an operable fire extinguisher
at hand
• Connect the machine to the mains power supply
Welding
WARNING: Using a welder correctly is a technical skill. A welder used incorrectly
can be highly dangerous. The information presented below is general guidance
only. If you are not entirely confident in your ability to use this tool safely DO NOT
USE.
• Move the Power Switch (3) to the 'ON' position
• Hold the Electrode Holder (4) in one hand, and the face mask in the other
• Position the rod at an angle of approx 80˚ to the surface, with the tip approx
30mm away from the metal
• Hold the mask over your face, and tap the rod against the metal
• An arc should strike between the metal, and the tip. Try to hold the tip of the rod
a distance away from the metal equal to the rod thickness. Maintain the arc for
1-2 seconds, then move the rod away
• Allow the weld to cool slightly, and move the mask away from your face. If the
settings were correct, a round “spot” weld should have formed
• If the weld has not completely penetrated the metal, increase the current
setting. If a hole has been made in the metal, reduce the current setting
• Practice making 'spot' welds until you are confident using the machine, and
selecting settings
• To form a 'seam' weld, maintain the arc for longer, and slowly move the rod
forward at the same time. The speed at which the rod is moved is crucial to
achieving a good weld
• If the machine settings are correct, the arc should be steady, and produce a
crackling sound. Be aware that you will have to gradually move the electrode
clamp closer to the metal as the rod is used
• Once weld bead is complete, remove excess and splatters using a chipping
hammer or wire brush. Do not attempt to weld over beads unless properly
cleaned
• Creating neat, high quality, welds is a skill that takes time to master. Practice
and good preparation will help to make satisfactory welds
Troubleshooting
Should you experience problems with the welder, please carry out the following
checks:
• That the welding current is correct for the diameter and type of electrode in use
• That if the power supply is on, the power indicator light in the ON/OFF switch
is on. If the power indicator light is not on there is a power supply problem (for
example a circuit breaker may have blown)
• That the correct voltage is being used as indicated on the rating plate
• That you have not exceeded the duty cycle and the thermal cut-out is in
operation
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