Re: [MW:28360] RE: 28355] Water Vapor in welded joints

Dear sir, 

My work shop is in Kerala, India.  The interesting thing is that the vapours are seen even in afternoon (Humidity may be >65%). After the weld got cooled, the surface of the joint is like somebody poured water on the joint. This is visible in SS only.This water vapours are not making any issue in Weld joint. 

I will share the photos latter. 

Is it related to heat conductivity of SS?

Is it related to flux as commented by a member of this group ? if so which component/metal contained in flux? 

Thank you all for the replay. 

Regards, 

Hareesh K V

On Fri, Sep 28, 2018, 7:59 PM PGoswami <pgoswami@quickclic.net> wrote:

Hi,

This is a case of moisture condensation. It's possible if the relative humidity(RH) factor is high, typically above 60% or more. In Indian subcontinent after the Monsoon RH could be very high contributing to this. Where's the location of your plant? Do you have any humidity control in the shop floor?, it may help.

Stainless steel does not require any preheating however some preheating ( typically up to 30-40 DegC)  is advisable to get rid of the moisture accumulation, typically happening due to condensation.

 

Thanks.

 

P.Goswami.P.Eng, IWE.

Welding & Metallurgical Specialist

Email:pgoswami@quickclic.net,pradip.goswami@gmail.com

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Hareesh K V
Sent: September 28, 2018 12:24 AM
To: materials-welding <materials-welding@googlegroups.com>
Subject: [MW:28355] Water Vapour in welded joints

 

Dear Veterans, 

 

After the cooling of weld joints, water vapor is seen in the surface of weld joints. What is the reason? This is particularly seen in SS welded joints. 

 

Regards, 

 

Hareesh K V

+91-8547859202

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