what’s induction PWHT-Post Weld Heat Treatment

weld heater induction manufacturer

Induction PWHT (Post Weld Heat Treatment) is a process used in welding to improve the mechanical properties and reduce residual stresses in the welded joint. It involves heating the welded component to a specific temperature and holding it at that temperature for a certain period of time, followed by controlled cooling. The induction heating method … Read more

Induction Preheat Welding Systems

Portable Post Weld Heating Treatment System With Induction 

Main Application:

l  Preheat: weld heat,coating, spraying, bending, fitting&unfitting heat

l  Post-weld heat treatment: tank, boile, pipeline, steel sheet or other metal jobs

l  InductionHeat: mold heating, shipboard, zinc bath, large& irregular metal parts

l  Pipeline material heat: pipeline oil, pipeline gas, pipeline water, pipeline petrochemical and other pipeline material

Main Features

* High speed: 70%

*  Low tolerance

*  Energy Saving

*  High efficiency

*  Accurate heating

*  Simple operation

*  Non-contact heating

*  Environmental protection

*  Hypothermia circumstance

* Air cooling is suitable for low-temperature environment

* Induction heating is more uniform than oil,gas,flame heating portable post weld heating treatment system

Input voltage 3*380V, 50/60Hz, 4 Wires
Input Current 1~30A 1~15A
Output Current 0~300A 0~200A
Output Power 1~20KW 1~10KW, Max 15KW, 150% duty cycle
Output Frequency 5~30KHZ
Thermocouple K type
Temperature system Build in induction machine
Heating Temperature Max800℃ Max500℃
Size 700 x 330 x 410 mm 650 x 310 x 410 mm
Weight 32kg 26 kg
Induction Heating coil
Length 10~20 M
Diameter 15 mm
Working temperature -30~45℃
Pipeline Size OD: 50~500mm or equivalent

Induction Preheating Welding Steel Pipe

Induction Preheating Welding Steel Pipe With High Frequency Heating System

Objective To preheat a steel pipe to 500ºF (260ºC) before welding.
Material Steel shaft assembly 5” to 8” OD (127-203.2mm) with a 2” (50.8mm) heat zone.
Temperature 500ºF (260ºC), if higher temperatures are required, heat time can be increased.
Frequency 60 kHz
Equipment • DW-HF-60kW induction heating system, equipped with a remote workhead containing eight 1.0 μF capacitors for a total of 8 μF.
• An induction heating coil designed and developed specifically for this application.
Process A multi-turn two position channel “C” coil, adjustable on a busbar is used to heat the desired heat zone. The coil is adjustable to fit various diameter pipes. The shaft is rotated in a fixture and heated for 3 minutes to achieve a temperature of 500ºF (260ºC).
Results/Benefits Induction heating provides:
• Preheating prevents shock to shaft which eliminates cracking in the welding phase.
• Hands-free heating that involves no operator skill for manufacturing.
• Even distribution of heating between the shank and the  sleeve.

induction preheating welding steel pipe







induction preheating steel pipe before welding