PWHT for Stress Relieving Using Induction Heating Systems

PWHT for Stress Relieving Using Induction Heating Systems Table of Contents PWHT for Stress Relieving Using Induction Heating Systems 1 Table of Contents 1 Introduction to PWHT for Stress Relieving Using Induction Heating Systems 2 What is Stress Relieving and Why is PWHT Necessary? 2 The Role of Post-Weld Heat Treatment (PWHT) 2 Stress Concentration … 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

MYD-20KW		MYD-10KW
Input voltage	*3380V, 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.