Re: [MW:11939] Pre-heat and Interpass temperature

from the best of my knowledge, determination of the interpass is depending on thickness range of the material. please find below the suggested interpass temperature:

1. up to 0.75 in : 400 F
2. 0.76 to 1.5 in : 400 F
3. 1.51 to 2.5 in : 450 F
4. over 2.5 in : 450 F

increasing interpass in multipass welding may cause the temperature in welded joint to rise to a point that can harmful to the material.

please also find the attached file to drive you how to determine the preheat. pick up the material that you want to join. Click PH to get the preaheat (top left corner).

rgds

2011/7/25 V B <vikas.bhandari349@gmail.com>

Hi 

Preheat can be determined by BS EN 1011-2 for ferritic materials. Refer to other sections of this standard for other type of materials. Preheat is determined based on thickness to be welded, material(C.E.), welding process /diffusible hydrogen content of the consumable.

Best regards 

On Mon, Jul 25, 2011 at 3:15 PM, Endri Prasetyo <endri.prasetyo@gmail.com> wrote:

Dear Member,

Anybody can share me how to determine the pre-heat and interpass temperature?

Is it correct if we determine the pre-heat based on the CE (carbon equivalent)?

And what about interpass?

Regards,

Endri

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