Selco Unistep 3500 - User Manual

Questions and Answers

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Justin AvilaAug 17, 2025
What to do if my Selco Unistep 3500 has no output power?
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  Ashley GreerAug 17, 2025
  If your Selco Welding System isn't welding, it could be due to several reasons. The torch trigger button might be faulty and needs replacement. The system may have overheated, in which case you should wait for it to cool down without turning it off. Ensure the system is correctly earthed. Check that the mains voltage is within the acceptable range. If none of these solve the issue, the electronics might be faulty, requiring service center assistance.
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Sandra RichardsonAug 20, 2025
How to fix a Selco Welding System that won't turn on?
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  zhangmichaelAug 20, 2025
  If your Selco Welding System fails to turn on (green LED off), several factors could be responsible. First, ensure that there is mains voltage at the socket, and repair the electrical system if needed. Check the plug and cable for faults and replace if necessary. Also, inspect the line fuse and replace it if it's blown. A faulty on/off switch could also be the culprit, requiring replacement. If none of these steps work, the electronics might be faulty, and you should contact a service center.
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Clayton BowenAug 22, 2025
Why does my Selco Unistep 3500 Welding System produce excessive spatter?
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  John RamosAug 22, 2025
  Excessive spatter in your Selco Welding System can be caused by several factors. The arc length may be incorrect, so decrease the distance between the electrode and the workpiece. Adjust the welding parameters by decreasing the welding voltage. Try using a higher setting inductive connection for arc regulation. Ensure sufficient shielding gas by adjusting the gas flow and checking the diffuser and gas nozzle. Also, adjust the torch angle, as the welding mode might be incorrect.
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nfosterAug 25, 2025
How to prevent porosity in Selco Unistep 3500 Welding System welds?
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  Terry CoxAug 26, 2025
  If you're experiencing porosity with your Selco Welding System, it could be due to several factors. Ensure the workpieces are clean from grease, varnish, rust, or dirt before welding. Use quality filler materials and keep them in perfect condition. Adjust the arc length by decreasing the welding voltage. Ensure the gas supply system is in perfect condition and free from humidity. Adjust the gas flow to ensure sufficient shielding. If the weld pool solidifies too quickly, decrease the travel speed, pre-heat the workpieces, or increase the welding current.
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Cynthia BrownAug 27, 2025
Why is the output power incorrect on my Selco Welding System?
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  coxjasonAug 28, 2025
  If your Selco Welding System's output power is incorrect, it might be due to the mains voltage being out of range. Ensure the system is correctly connected. Another possibility is a missing input mains phase; ensure proper connection. If these steps don't resolve the issue, the electronics may be faulty, requiring assistance from a service center.
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Shannon GriffinAug 30, 2025
What causes arc instability in a Selco Welding System?
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  Andrew HillAug 30, 2025
  Arc instability in your Selco Welding System can arise from insufficient shielding gas, so adjust the gas flow and check the diffuser and gas nozzle. It may also be caused by incorrect welding parameters, so carefully check the welding system.
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khandebraSep 1, 2025
How to improve penetration with my Selco Welding System?
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  Amy WeberSep 2, 2025
  Insufficient penetration with your Selco Welding System can stem from several issues. Adjust the welding mode by decreasing the welding travel speed. Modify the welding parameters by increasing the welding current. Adjust the edge preparation by increasing the chamfering. Ensure the system is correctly earthed. If the pieces are too big, increase the welding current.
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Kent ReedSep 4, 2025
Why is my electrode sticking when using my Selco Unistep 3500 Welding System?
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  ryansmithSep 4, 2025
  Sticking with your Selco Welding System could be due to incorrect welding parameters, so increase the welding current. Adjust the welding mode by angling the torch more. If the pieces are too big, increase the welding current. Also, try using a higher setting inductive connection for arc regulation.
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Christian PatelSep 6, 2025
What causes undercuts when welding with a Selco Unistep 3500?
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  David HarperSep 7, 2025
  Undercuts in your Selco Welding System welds can be caused by incorrect welding parameters, so decrease the welding voltage. Adjust the welding mode by decreasing the side oscillation speed while filling and decreasing the travel speed while welding. Ensure sufficient shielding gas by using gases suitable for the materials being welded.
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Patrick BrownSep 9, 2025
How to prevent oxidations when using my Selco Welding System?
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  Jimmy DukeSep 9, 2025
  If you notice oxidations when using your Selco Welding System, it's likely due to insufficient gas protection. Adjust the gas flow and check the diffuser and gas nozzle to ensure they are in good condition.