WDV-PD Coils for Pre-Weld Demagnetization

WDV-PD Coils for Pre-Weld Demagnetization


The cycle time to Demag, after the Coil is placed on the end of a Pipe, is less than 30 seconds. The Reversing and Reducing DC Demag lasts for over a week, requiring a Demag Crew work ahead of the Welders, not slowing production. To ensure demagnetization has been achieved, operators need to use a gauss meter to check the pipes' weld bevel. Generally an acceptable level of magnetization for welding (manual or automatic) is a field of ±2 Gauss.

Coil Models from the WDV-14-PD and below weigh less than 60 Pounds (27kg) are intended to be handled manually by the operator. The WDV-16-PD weighs just over 100 Pounds (45kg) and is intended to be positioned with a utility crane. The WDV-60-PD weighs just over 1000 Pounds (455kg), requiring the use of a dual wheel truck with a bumper mount crane. The same truck will require a generator appropriately sized for the Coil. A WDV-8-PD requires 1500 watts, while the WDV-60-PD requires 15 Kilowatts, making a 1 ton truck acceptable. Most modern engine driven Welders as used on a Pipeline Right of Way, have sufficient AC Power for even the largest WDV-PD Coils.



Western's WDV-PD Series Coils are developed for pre-weld demagnetization. If pipes are magnetized, welders will experience Arc Blow, which will lead to weld defects.

Coil Model Minimum OD Size Maximum OD Size Amp-turns
WDV-8-PD 1.9" (48mm) 71/2" (190mm) 12,500 Amp-turn
WDV-10-PD 23/8" (60mm) 95/8" (244mm) 12,500 Amp-turn
WDV-14-PD 41/2" (114mm) 123/4" (324mm) 14,000 Amp-turn
WDV-16-PD 95/8" (244mm) 14" (356mm) 16,000 Amp-turn
WDV-18-PD 103/4" (273mm) 16" (406mm) 18,000 Amp-turn
WDV-25-PD 16" (406mm) 24" (610mm) 25,000 Amp-turn
WDV-32-PD 24" (610mm) 30" (762mm) 32,000 Amp-turn 
WDV-38-PD 30" (762mm) 36" (914mm) 38,000 Amp-turn
WDV-44-PD 36" (914mm) 42" (1067mm) 44,000 Amp-turn
WDV-50-PD 42" (1067mm) 48" (1219mm) 50,000 Amp-turn
WDV-60-PD 48" (1219mm) 56" (1422mm) 60,000 Amp-turn

Product Literature

Description Part # Saved Price Select Option Add to
Western Instruments Pipeline Pre-Weld Demagnetization MT-WN-PRE-WELD-DEMAG Request Pricing