Re: [MW:16387] welding of alloy 800HT

Dear Pratap.

To my knowledge & experiance:-

 

1) Effectiveness will be seen in Test results.... 

It is an Austenitic structure , so Argon purging is required (to de-oxidations)

Answer of query no.1.& 2.

2) You can go for SMAW..(Good practice follows by Temper bead technique with TIG roots , Check Dp after every TIG root.)

 

3) Yes , Few portion of weld may effect microstructure , u must grind/gauge them properly to reduce/minimse chnces of falures..

 

4) It is best filler wire for sort of application..

It is also used for joing of Co rich &  Nickel Rich Plates (Dis-simaler joints)

 

5) Interpass temp is strictly maintained to MAX 150 Deg C.

 

@Dear Experts:- Pls , coorect me , if i am wrong....Also  pls elaborate that

This fiiler wire ERNiCrCoMo-1 is or can be used for joining Nickel rich (Min50%) & cobalt rich (Min 50%) metals /plates.pipes

 

With regards,

 

Ashish P

 

 

 

On Sun, Dec 30, 2012 at 4:53 PM, Manindra Singh <hellmanya@in.com> wrote:

Dear all,

we have to weld Alloy 800 HT material for steam methane reformer outlet header using TIG methodology and filler wire ER NiCrCoMo-1 . However, due to access constraint, we are having doubt on effectiveness of argon purging during welding.

It may be noted that after root run of few portion, inner surface of weld was inspected and found to have shiny surface but base metal adjacent to weld bead is having grey color marks.

now the question is:

1. How to check effectiveness of argon gas purging while welding with respect to root weld profile?

2. What kind of problem may come in future, if purging was not proper for weld?

3. Can we apply SMAW welding procedure for complete weld profile ( root, hot, filler and final passes)?

4. Few portion of old weld has been left on inner surface of pipe, whether it will affect the new weld or quality of weld?

5. Is there any other filler wire suitable to weld such kind of material?

6. Effect of interpass temperature ( i.e. 200-250 deg C),if not strictly maintained ?

Thanks and regards,

Pratap

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