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Dissimilar metal welding...

Dissimilar metal welding...

Dissimilar metal welding...

(OP)
I have a client that wants to weld 316SS to A234 WPB cast steel pipe fitting(adding S.S. bar to a tee for pigging). I know this is possible, but is there any procures that needs to applied to the weld after assembly? ...like post heat treatment? What are the characteristics of this weld (brittle, prone to cracking?) THANKS! ...Mark

RE: Dissimilar metal welding...

Here is some information to help you develop a WPS for P1-P8 GTAW Weld.

Base Metal    "Austentic Stainless Steel to Carbon Steel P1-P8"                    
Weld Joint (mm)    Thickness     6.4    12.7
Weld Position     Flat    

Filler Wire Specification    AWS A5.9    Filler Wire Class    ER 309    

Single Vee Butt    4    6

Electrode Type     Tungsten (EWTh-1/-2)
Cup Diameter (mm)        2.4 to 3.2    3.2    3.2 or 4.0
Number of Passes    1 to 2    2 to 3
Gas Nozzle Cup Type    Water-cooled
Current (amps)    -    -    -    -    -    -
Current Type       DC neg

Single Vee Butt       275-350    350-450

Welding Speed (mm/sec)      2.1    hard to predict


Gas    Argon   
Gas Flowrate (L/min)     6    7
Gas Pressure (kPa)    140
Gas Nozzle Limits (water-cooled)    > 250 Amps   

Out of Position Welding    
Vertical and Overhead Current    reduce by 10-20%    reduce by 10-20%

Austentic Stainless to Carbon Steel welding is fairly common. A few words of caution -

1.Watch for hot cracking, I have had clients that have required a Liquid Pentetrant test be performed after every pass.

2. Corrosion may be an issue. The SS and CS make a fairly strong Galvanic cell.

I have also had to butter the Carbon Steel with 310 stainless before welding with 309 at another client's facility.

Check with AWS www.aws.org that may have a Quailified WPS/PQR that you may license (pay for) and use for your application.
 

 

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