[MW:17149] Welding of Weldox 700 plate with backing

Dear  welding peole

 

 

We had Weldox 700 plate with 6 mm thickness, using GMAW method with backing.

 

First we made:    2  passes  with ER110SG   (1.2 dia wire) with backing : failed ( root bending)

Second         :     3 passes  with ER110SG (1.2 dia wire) with backing  and pre heating(25 C) : failed (root bending)

 

We will try for the 3rd time.  I am planing to use :

 

ER100SG (1 mm  dia wire)  with backing ------------ root run

ER110SG (1mm dia wire) with backing    ------------ all other  

we will apply preheat also (around 25 C)

 

 

Is there anyone has experience about 6mm weldox 700 with backing. Do you have any PQR and WPS ?

 

 

Regards

 

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