Re: [MW:12961] Cracking problem during Hardfacing (FCAW)

due to high hardness, stress relief cracks will occure and reduce heat
input or contact the consumable supplier for guidlines
pandithan

On 11/13/11, salman cader <salman96996@gmail.com> wrote:
> .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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>
> --
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>

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