Skip to main content

[MW:33486] Re: FW: Welding Superduplex

Could you please what happen after that and what is the parameter you used to pass the corrosion test?

On Thursday, January 2, 2014 at 4:24:01 PM UTC+3 tan billy wrote:


Dear Experts,

I have try to qualified repair procedure  14'inch superduplex pipe 30 mm thickness(UNS32750) where using purging and shielding gas 98% Ar and 2% N2.Unfortunately I failed on the pitting  corrosion testing(35⁰C)5g/m2 weigh loss(test required 4g/m2)G48 method A. Original weld pass at 0gram weigh loss. Piting was found at side(near excavation area) and root weld where the side of test piece is more severe . Heat input for root around 1.2KJ/mm and the rest passes are 0.8-1.1kjmm. Filler wire used is ER2594.

 

a)Can you guys provide information for the purging usually used( I am using only span), suitable environment for welding superduplex? 

b)Do we need to cut off the tip of the filler wire if it is oxidized(reused wire)?

c) Can we use power brush for interpass cleaningexclude capping?

d.) The deposite thickness is thin for every pass in order to get high travel speed/low heat input?

e)  I am using cleaning agent acetone to clean the bevel , does this matter?

  Please let me know if any goes wrong.

 

Weld details

1.)    Single V joint

2.)    Sample extract from to position. Welded 6G position.

3.)    Repair procedure. Excavation up to 6mm root ligament where as per drawing.

4.)   

5.)    Pitting corrosion picture

6.)    Interpass temperature <100⁰C

7.)    Oxygen level <50ppm, excavation method grinding.

8.)    Interpass cleaning, power brush.

9.)   

10.)

 

 


--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/1a90017f-edd2-4937-9c2f-4e65decd9b06n%40googlegroups.com.

Comments

Popular posts from this blog

Materails FAQs

Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...

Re: [MW:10788] ON PLOT PIPING & OFF PLOT PIPING

Piping systems involved for the flow lines and gathering lines from the well head isolation valve to the production facility or processing plant isolation valve are determined as OFF PLOT. ON PLOT defines piping system in the processing plant and production platform. ANSI/ASME B31.4 applies for off plot piping system. B31.4 allows the use of either API 1104 or ASME section IX (as appropriate). However, occasionally, a very small system such as piping within 500 feet of a processing plant (some client also said 400 feet) may be declared B31.3 rather than B31.4. When B31.3 is invoked, only ASME Section IX is used. before you decide which code to use for welding procedure and/or welder qualification for pipe welding, you have to know the design and construction code applicable to the system. Please read far enough into scope and diagram illustrating the application of either B31.3 and B31.4 hope this helps rgds 2011/4/21 pradip kumar sil < pradipsil@gmail.com > Dear all, ...

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change.   Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...