Miller PipeWorx 400 User Manual (English)

Questions and Answers:

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James PrinceAug 19, 2025
What to do if wire doesn't feed from the wire feeder to the end of the Miller Welding System gun?
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  Christina HaasAug 19, 2025
  If the wire isn't feeding correctly, start by checking if the wire diameter matches the groove size of the drive rolls. Also, ensure the tension on the drive rolls isn't too loose or too tight. Verify the gun liner is the correct size for the wire and that the contact tip is the correct size for the wire, ensuring it's not plugged. Finally, check that the gun end is fully inserted into the wire drive housing at the feeder and that the knob is tightened to secure it.
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goldenzacharyAug 21, 2025
How to troubleshoot trouble feeding wire when welding with a Miller Welding System?
- S
  sharon84Aug 21, 2025
  To troubleshoot wire feeding issues, first check that the drive rolls and wire guides match the wire style and size. Adjust the drive roll tension if needed. Make sure the gun end is fully inserted into the wire drive housing and the knob is tightened. Check the hub tension at the wire spool and readjust if necessary. Ensure the welding gun cable is as straight as possible from the wire feeder to the workpiece. Verify the contact tip is the correct size for the wire and not plugged. Also, check if the gun liner is the correct size for the wire and that it is not dirty or damaged; clean or replace it if necessary.
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Lauren LarsonAug 23, 2025
What to do if weld is not consistent from one welding application to another using Miller PipeWorx 400 Welding System?
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  Jessica LiAug 25, 2025
  To ensure weld consistency, make sure the work clamp is connected to a clean, paint-free area of the pipe; grind the area if necessary to make a good connection. Keep the work clamp as close as possible to the joint being welded. Check if the volt sensing lead is connected to the welding power source and that the work connection is secure, looking for frayed wires. Be sure the volt sense lead is separated from weld cables. Maintain a gun angle straight in to 15 degrees back at the joint during welding. Follow the recommended settings in the Operation section of the manual to select a starting point for welding. The recommended joint preparation and fit-up is 1/32-1/16 in (0.8-1.6 mm) land and a 1/8 in (3.2 mm) root opening.
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Scott ChambersAug 26, 2025
What to do if weld terminals are dirty on Miller Welding System?
- R
  Roberto ShortAug 26, 2025
  To resolve issues with weld terminals on your Miller Welding System, cleaning the terminals is the suggested solution.
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William PearsonAug 27, 2025
What to do if torch body is cracked on Miller PipeWorx 400?
- T
  Tammy JohnsonAug 27, 2025
  If the torch body on your Miller Welding System is cracked, it is recommended to replace it.
C
Connie JonesAug 30, 2025
Why is there porosity in my Miller PipeWorx 400 weld bead?
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  qhawkinsAug 30, 2025
  Porosity in the weld bead can occur due to several factors. You should check the shielding gas supply to ensure there is enough gas and that the supply is turned on. Also, verify the shielding gas flow rate at the regulator and make sure the gas pressure to the wire feeder does not exceed 90 psi (621 kPa). Check all shielding gas fittings and tighten if necessary. Inspect the O-rings on the gun end and replace any worn or missing ones. Tighten the power pin end of the gun with a wrench. Ensure the gun end is fully inserted into the wire drive housing and the knob is tightened. Clean the shielding gas nozzle on the gun and shield the joint from wind.
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Ann HaynesSep 1, 2025
What to do if my Miller PipeWorx 400 Welding System has no weld output and the meter display is on?
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  franklinmonicaSep 1, 2025
  If there's no weld output but the meter display is on, check, repair, or replace the remote control. The unit may have overheated; allow it to cool with the fan on. You can also check the voltmeter/ammeter Help displays.
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Regina ColeSep 3, 2025
What to do if my Miller PipeWorx 400 Welding System has erratic or improper weld output?
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  Michael JonesSep 3, 2025
  If you're experiencing erratic or improper weld output, ensure you are using the proper size and type of weld cable. Clean and tighten all weld connections. Also, check the volt sense lead and straighten any coiled cables.
E
Emily FowlerSep 5, 2025
What to do if my Miller PipeWorx 400 Welding System welding power source is plugged in and there is no power after turning on unit?
- E
  Eric SmithSep 5, 2025
  If the unit is directly connected to a line disconnect box or plugged into a receptacle from a line disconnect box, be sure that the line disconnect switch or main breaker is in the ON position.
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johnsonabigailSep 7, 2025
What to do if there is no 115 volts AC output at the single receptacle on my Miller PipeWorx 400?
- V
  Veronica SteinSep 7, 2025
  Reset supplementary protector CB1.

Miller PipeWorx 400 Specifications

General

Amperage Range	5 - 400 A
Duty Cycle	60% at 400 A
Processes	MIG, Flux-Cored, Stick, DC TIG, Pulsed MIG
Output Voltage Range	10 - 44 V
Wire Feed Speed	50 - 780 IPM