Skip to main content

[MW:1375] Re: Calibration, Validation of welding machines as per BS 7570 standard.

By Materials & Welding
Hi all,
Calibn - OK, Process- validation required in case of any change in essntial variables only.
Otherwise, most Codes do accept certain std processes for their work, if not, then validation would be definitely required.
Rgds,
S Vagal

--- On Mon, 1/12/08, Muni Andy <cmkfc07@gmail.com> wrote:
From: Muni Andy <cmkfc07@gmail.com>
Subject: [MW:1369] Re: Calibration, Validation of welding machines as per BS 7570 standard.
To: materials-welding@googlegroups.com
Date: Monday, 1 December, 2008, 4:52 PM

Dear Friends,
Welding equipments need calibration i e the ammeter and voltmeter is to be calibrated.Frequency is once in 3 months.
validation is required for the welding process and not for welding equipments.
Regrds,
C.Muniyandi

On Mon, Dec 1, 2008 at 11:43 AM, <kataiah@bilfal.com> wrote:

Dear friends,

I am not very clear about the words Calibration, Validation of welding equipments.

Calibration is defined in some of the literature as all the operations for the purpose of determining the value or errors of a measuring instruments. (Checking the measuring instruments correctness such as A, V meters)

where as Validation is defined as all the operations for the purpose of demonstrating that an item of Arc welding equipment or welding system complies with the operating specification for that welding equipment or syestem( Checking the correctness of equipment).

I seen many fabrication  shops  doing calibration not Validation.

BS 7575-2000  is also having titile  " Code of Practice for Validation of arc welding equipment".

Can any body  suggest me  wether welding equipment requires  Calibraion or Validation?

Regards

P.K



Be the first one to try the new Messenger 9 Beta! Click here. --~--~---------~--~----~------------~-------~--~----~
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

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

[MW:5202] RE: 5200] NDT after PWHT

By Materials & Welding
------------------------------------- Interpretation:  I‑89‑14 Subject:         Section I (1986 Edition, 1987 Addenda), PW‑11,                  NDE Prior to PWHT Date Issued:     December 15, 1988 File:            BC88‑393   Question: Does PW‑11 require that NDE be performed on welds after they have been subjected to the postweld heat treatment required by PW‑39?   Reply: No, unless the conditions described in PW‑11.2.2 exist. ---------------------------------------------- Interpretation:  VIII-1-98-09 Subject:         Section VIII, Division 1 (1995 Edition, 1996 Addenda); NDE                 ...
Post a Comment
Read more

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