Hi,
The procedure said by Mr. Rajasekar is correct. Meanwhile in addition to that there should not be any welding interruption. Also the minimum preheat temp. to be maintained till completion of weld. After Welding completion Post heating to be done Around 80°C to 100°C for 1 hr. and PWHT should be done simultaneously. The weld shouldnot be exposed to moisture until completion of PWHT.
Better use induction heating machine for preheating and post heating.
M. Sivachidambaram
+971561530899
On Sun, Aug 11, 2013 at 3:41 PM, Octane Mac <octane.mac@gmail.com> wrote:
Fully agreed with this procedure.--For dissimilar welding, pre-heat & PWHT needs to be set for the one requiring more temperature; consumable to be set matching the needs of less alloyed (applicable in carbon &low alloy steel group)
Octane
On Tuesday, August 6, 2013 1:53:10 PM UTC+3, RAJA SEKAR wrote:Dear Mugesh kumar,
Consumables used
Spec. No : SFA 5.5
Aws Classification : E-9018-B3
Heat treatment
Preheat : Min 220 deg celsius
Interpass : Max 350 deg celsius
Postheat : 220 deg celsius for 1 hour
PWHT : 745+ 15 deg celsius
In my company for P22 to P91 pipe to pipe butt joint, the above said parameters and consumables are used. Based on my experience I give this detail. Is there any wrong plz correct me.
Regards
Rajasekar.A.S
On Monday, August 5, 2013 10:12:08 AM UTC+5:30, Mukesh Kumar wrote:Dear All,
We are having requirement of welding of P22 saddle support with P91 pipe for High pressure steam piping for refinery project.
I have following queries.
1. Is it technically feasible to weld these metals without difficulties.
2. Which welding consumable to be used.
3. What precautions to be taken prior to nd during welding of these materials.
Would appreciate your advise on the above points.
Regards
Mukesh kumar
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