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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