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Re: [MW:12959] Cracking problem during Hardfacing (FCAW)

By Materials & Welding
.it could be the sulphur in your wire,try using a consumable with Mn
.check your hydrogen per 100mg .temperature at which you
welding,parent metal clean and dried ......check if you prep is not
deep and narrow because it create voids(wider prep)check for hi
cooling but honestly in my opinion you have contaminants like sulphur
or phospherous or you got a narrow prep .can be illuminated by proper
prep and also check if your consumables is right.something is dirty or
contaminated because that is the cause of any crack.............
peace out

On Sun, Nov 13, 2011 at 12:14 PM, ajay pawse <ajaypavashe@yahoo.com> wrote:
> Hello Friends,
>
> We are conducting trials for Tungsten carbide Hardfacing on F-22 material
> (2.1/4Cr - 1 Mo). we are facing problem of transverse hairline cracks on
> weldbead. need your help to overcome this problem.
> Process: FCAW
> Filler wire Dia: 1.2mm
> Cuerrent used: during trial we changed current from 87Amps to 140Amps.
> different runs were taken but all cracked
> Volts: 16 to 19.5V
> Wire feed: 2.8 to 5m/min
> Travel speed: 235 to 600mm/min
> Preheat: 120 to 260DegC
> Shielding: Argon
>
> With these parameters, we achieved satisfactory weld bead appearance though.
>
> Please let me know if i am missing any factor which is vital for the success
> of the process. also need you guidance on the parameters i tried.Hope to see
> your suggestions soon
>
> Please let me know if anyother info is needed.
>
> Thank you.
>
> Regards,
> Ajay
>
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