Re: [MW:12364] Alloy 625 Overlay By GMAW (Short Circuit & Spray Transfer)

Hi

 

Thanks for the input.

 

Since i don't have Pulsed GMAW M/C, I'll try with Short circuit mode on normal GMAW Machine

 

On Wed, Sep 7, 2011 at 4:52 PM, vaibhav Joshi <vnjoshi.leo@gmail.com> wrote:

Dear,

For the overlay of 625 on C/S or LAS it is always good to have a process with less dilution. 

For GMAW , Short circuit has a lowest possible dilution bcz it operates on lower current which sometimes results in overlay defects like Lack of side wall fusion specifically in overlay of Nickel base alloys.

Recommendation is go with pulse spray transfer mode which is very well established. additionally you can use 75:25 Ar + He to get excellent flat beads. you can get a desired chemistry within Barrier + 1 layer deposition.

Find an attached photograph of a trial plate conducted using above recommendations.

Regards,

Vaibhav Joshi

On Wed, Sep 7, 2011 at 9:22 AM, K.Babu <kbabupsg@gmail.com> wrote:

Gents, 

 

Pls share your expereince

 

What is the better mode of trasnfer on GMAW (Normal, no pulsing) overlay ?

 

Oveylay is on the thicker (>75 mm) components.

 

Shielding : 100% Ar ,

 

Wire Dia : 1.2 mm

 

Material : AISI 4130,

 

Max.  %Fe : 5%

Thanks & regards,

K.Babu
Singapore

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Thanks & regards,

K.Babu
Singapore

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