Re: [MW:7355] Best way for Preheating of Bush & shaft Welding

Thanks raghu,

I would like to add on..Induction heating's similarity to resistance heating is that conduction is required to heat thru' the section or part. The only difference is the source of heat and the temperatures of the tool. The induction process heats within the part and the resistance process heats on the surface of the part. 

My recommendation is for you to go for induction coil preheating.

On Mon, Oct 4, 2010 at 6:54 PM, Bathula Raghuram (Mumbai - PIPING) <R.Bathula@ticb.com> wrote:

An induction heating system induces heat electromagnetically rather than by using a heating element to conduct heat

In induction heating, electric current flows through the coil, generating a magnetic field in the part. The rapidly changing magnetic field creates eddy currents in the part, causing heat to be generated. This is similar to the heat generated in a transformer. The coils do not heat up, so welding can be done while the coil is still attached.

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Devarajan Ramasamy
Sent: Monday, October 04, 2010 4:10 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:7352] Best way for Preheating of Bush & shaft Welding

 

Yes similar.. 

On Mon, Oct 4, 2010 at 6:30 PM, Engineer Mech <mengineer010@gmail.com> wrote:

Dear Devarajan,

 

May i know induction coil heating is it same as Electrical resistance heating for PWHT,

 

Thanks

On Mon, Oct 4, 2010 at 1:18 PM, Devarajan Ramasamy <neo.devarajan@gmail.com> wrote:

For any preheating more than 150 deg C, induction coil heating is much preferred. 

 

On Mon, Oct 4, 2010 at 4:53 PM, Engineer Mech <mengineer010@gmail.com> wrote:

Dear All,

Job is Bush & Shaft welding,
Shaft is about 300 mm OD, Preheating is 220 degree celsius
By which way i can do preheating, Heating torch is enough for
preheating of this job, or Electrical resistance heating is it need to
do?
I think Heating torch is ok!
Pl clear me...

Regards
M

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