Re: [MW:13120] what is the root cause for copper crack in saw welding ?

Dear MPK,
Copper is one of the elements which causes HOT CRACK.
There are two types of Hot Crack
1. Solidification Cracks: Occurs in the Weld Metal (Usually along the
centerline of the weld) as a result of the solidification process.
2. Liquation cracks: Occurs in the course grain HAZ, in the near
vincity of the fusion line as a result of heating the material to an
elevated temperature, high enough to produce liquation of the low
melting point constituents placed on grain boundaries.

Weld bead solidification started above 1400 deg C, and the melting
points of copper is near 1100 deg C.
This is the basic reason.

On Tue, Nov 29, 2011 at 7:02 PM, mpk mpk <ranmi2007@gmail.com> wrote:
> Dear Experts,
>
> What is the Root cause for copper crack in SAW welding ?
>
> thanks,
>
> MPK
>
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Thanks & Regards
Biplab Pal
Industrial Services, Inspection Engineer.
SGS India Pvt. Ltd.
Kolkata Branch
E-mail:   biplab.mech@gmail.com

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