Skip to main content

Re: [MW:14912] From GTAW bare filler with Ar shield to GTAW Fux Cored filler without Ar shield

By Materials & Welding
You have to prepare a new WPS and qualify the welding procedure.
Change in filler metal product form is an Essential variable as per ASME Sec.IX QW-404.23

 

QW-404.23 A change from one of the following filler

metal product forms to another:

(a) bare (solid) or metal cored

(b) flux cored

(c) flux coated solid or metal cored

(d) powder
 Is an essential variable for GTAW process.

Regards
 
Prem Nautiyal

--- On Fri, 7/20/12, Shashank Vagal <nach_sam@yahoo.com> wrote:

From: Shashank Vagal <nach_sam@yahoo.com>
Subject: [MW:14905] From GTAW bare filler with Ar shield to GTAW Fux Cored filler without Ar shield
To: materials-welding@googlegroups.com
Date: Friday, July 20, 2012, 9:50 AM

Gents,
This one is related to switch over of GTAW electrode - from a bare one requiring Ar purging + shielding to the other flux cored one not requiring purging + shielding due to inaccessibility and large / long pipe sections under welding.
We have a WPS for using ER308L - Esab which requires Ar purging and shielding. But now, due to difficulties in maintaining Ar gas inside the long sections of large dia SS 304L pipes during root pass our contractor has suggested another electrode which does not need Ar purging + shielding.

Is this switch over allowed without re-qualification?

Alternate electrode suggested is this: KOBE TGX 308L STAINLESS STEEL FLUX CORED TIG WIRE (possibly 2.2 mm dia)

Thanks,

Shashank Vagal

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

Comments

Post a Comment

Popular posts from this blog

Materails FAQs

By Materials & Welding
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...
21 comments
Read more

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

By Materials & Welding
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...
Post a Comment
Read more

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

By Materials & Welding
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, ...
Post a Comment
Read more