Experimentally you can use one of the well known severity tests such as the Implant test, the Tekken Test or the CTS test.

You can determine the preheating temperature using the Chart method by Yurioka and Kasuya (A Chart method to determine Necessary preheat temperature in steel welding, Quarterly Journal of Japan Welding Society, Vol 13 No. 3 1995, 347-357).

Alternatively you can use the TOOLKIT sofware available on line by The TWI, UK

Suresh,

ER70s-6 Is the filler metal you have selected, belonging to the low hydrogen class. In order to calculate recommended Preheat and Interpass tempuratures, you need to specify the base metal as well. The following steps will help you make a decision for mild (low carbon) steels.

Gather the following data for your base metal and other variables:

1. Heat input (KJ/mm) and welding method (SMAW, etc).

2. Calculate the Carbon equivalence

3. Determine the Hydrogen Scale for your filler metal (mL/100g.)

4. Determine combined thickness for the weldment (i.e. 2T for a butt weld, etc)

Finally, plug all of that data into the publicly available "Pre-Heat Calculator" located at the following link:

http://www.gowelding.com/weld/preheat/preheatcalc.htm

I hope that you find this helpful,

J. Cole Zimmermann

Thank you Mr. J Cle Zimmermann. I will proceed.

Mr. J Cole Zimmermann, May i get the exact values of Density, Specific heat and Thermal conductivity for ER70S-6?