Re: [MW:4324] AFFECT POLARITY IN HEAT INPUT

A little notes.... that i remember

current will flow from the negative side of the voltage source, through the resistor, and then to the positive side of the voltage source. This is exactly how a welding circuit works. Current flows from the negative side of the welder, through the arc, and then back to the positive side of the welder. A  effect of this is that more heat goes in the direction of current flow–Approximately 2/3rds of the heat will go to the positive side of the circuit.So if you've got your electrode hooked up to the negative terminal of the welder, (DCEN-DC electrode negative), approximately 2/3rds of the heat will be put into the workpiece.The opposite is true for (DCEP), 2/3rds of the heat will be biased towards the electrode.
This is how the Heat input varies.

 

Regards

Chitturi

 

On Mon, Feb 15, 2010 at 6:55 PM, John Henning <jhenning@deltak.com> wrote:

The Code recognises that a change in polarity will affect heat input.  Thats why Sc IX assigns a change in polarity, QW-409.4 is a supplementary essential variable, and any change in polarity must be requalified with a new PQR.  Without impacts QW-409.4 is a non-essential variable and must only be appropriately addressed on the WPS.

 

John

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Singh Rishi (TIPO - QA/QC)
Sent: Sunday, February 14, 2010 11:40 PM
To: materials-welding@googlegroups.com
Subject: RE: [MW:4314] AFFECT POLARITY IN HEAT INPUT

If one checks the heat input formula, there is no variable for the polarity.

 Therefore , as per standard,  Polarity  doesn't influence the H.I .

 

 We all understand that actual H.I differs from calculated  H.I as current / voltage/ travel speed are never a single value ( specially in manual welding )

Best Regards,

Rishi Raj Singh

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of ali asghari
Sent: Saturday, February 13, 2010 9:59 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:4297] AFFECT POLARITY IN HEAT INPUT

 

thank you

but my inyention is distribution of heat is differed by polarity , therefore H.I depend to polarity.is it true?

regards

On Sat, Feb 13, 2010 at 2:04 AM, <george.dilintas@gr.bureauveritas.com> wrote:

It is because of the difference of the electrons flow I think

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  From: Ali Asghari [asghariali@rocketmail.com]
  Sent: 11/02/2010 23:44 PST
  To: materials-welding@googlegroups.com
  Subject: [MW:4291] AFFECT POLARITY IN HEAT INPUT

 

Hi All

all know that heat input is independent from polarity.but  i see in GTAW that in DCEN ,70%HEAT generated in arc concentrated in parent metal & in DCEP 30% HEAT concentrated in base metal.

can anybody clarify it?

regards.

 

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