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950704 - ESAB 85A 1200V Reverse Polarity Power Diode

Packaging: pack of 1
$199.14/EA $119.31/pack of 1 only $119.31/EASave 40%

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OVERVIEW

Restore Your Welder's Performance

The ESAB 950704 Diode is a critical replacement component for welding professionals looking to repair or maintain their power sources. This is a reverse polarity diode, meaning the stud acts as the anode and the lead as the cathode (typically), which is a specific requirement for the negative side of many rectifier bridges. Rated for a substantial 85 Amps and a peak repetitive reverse voltage of 1200 Volts, this diode is built to manage the high-power output required for MIG, TIG, and Stick welding processes.

Welding machines rely on a bridge of diodes to rectify input power. Over time, heat stress, electrical surges, or age can cause these components to fail, often resulting in a "humming" machine with low output or blown fuses. Replacing a faulty diode with the ESAB 950704 restores the full-wave rectification necessary for a smooth, stable DC arc. The 1200V rating provides a significant safety margin against voltage spikes that occur when the welding arc is struck or broken, protecting the rest of the machine's sensitive electronics.

Installation of this stud-mount diode requires attention to torque specifications and thermal management. Ensuring a clean mounting surface and proper connection is essential for heat dissipation, as the diode dissipates heat through its stud into the heat sink. This part is an authentic ESAB replacement, ensuring compatibility with the mounting threads and electrical characteristics of your original equipment. Don't compromise on generic parts for your power source; trust the ESAB 950704 to deliver the consistent power your welds demand.

Technical Highlights:

  • Type: Reverse Polarity Power Diode
  • Rating: 85A / 1200V
  • Application: Main power rectification in welding machines
  • Function: Converts AC input to DC welding output
Additional Information
Amperage:85
Voltage:1200 V
Packaging Description:1 Per Ea
Component Type:Diode
Polarity:DCEP
Current Rating:85 A
Voltage Rating:1200 V

INCLUDED

  • 1 x Diode Reverse 85A 1200V

APPLICATIONS

  • Repair of ESAB welding power sources
  • Replacement of failed rectifier diodes
  • Maintenance of industrial DC welding equipment
  • Restoration of full-wave rectification bridges

FAQ

The difference lies in which part of the diode is the cathode and which is the anode relative to the mounting stud. In a reverse polarity diode, the stud is typically the anode, whereas in a standard polarity diode, the stud is the cathode. You must use the correct type for your specific rectifier bridge location.

Common signs include a welding machine that hums loudly but produces low or no output, or one that constantly blows fuses. You can test a diode with a multimeter in 'diode check' mode; it should conduct electricity in only one direction. If it conducts in both or neither, it is likely faulty.

No, this diode is specified for 85 Amps and 1200 Volts with reverse polarity. It should only be used in machines that require these specific electrical ratings and physical mounting dimensions. Always check your machine's parts manual.

The 1200V rating refers to the Peak Repetitive Reverse Voltage (VRRM). It indicates the maximum voltage the diode can block in the reverse direction without breaking down. A higher rating provides better protection against voltage spikes common in welding.

Yes, it is generally recommended to apply a thin layer of thermal compound (heat sink grease) to the mounting surface of the diode to ensure efficient heat transfer to the heat sink, which prevents overheating.

Yes, the ESAB 950704 is a genuine OEM replacement part designed to meet the original factory specifications of ESAB welding equipment.

Rectifier bridges use a combination of standard and reverse polarity diodes to direct current. Installing the wrong polarity will cause a short circuit, likely blowing fuses or damaging the transformer immediately upon power-up.