Answer / m p kumar

Welding Procedure Specification is a procedure/plan of
steps written to welding before welding

Proedure Qualification Record is a record of welding while
welding,

Answer / balaji

Before the inspection, the WPS document is the object of attention of the welders. Meanwhile, during and after the inspection, the PQR is the document of concern for inspectors, contractors/manufacturers, and welders.

Answer / viviyan

pWPS---->PQR----->WPS------>WPQ
This would be the preferred sequence. Based on literature survey, consumables available, feasible process(es), etc. a proposed WPS is made and a procedure coupen is welded based on the pWPS. The PQR coupen is welded and the various variables(parameters) noted. The Procedure coupen is then tested to check the integrity of the joint and suitability to the application based on acceptance criteria spelt out in the specification(s) and code(s). Once tested ok, the PQR is documented. Based on the PQR , a WPS is generated based on the limits specified for the essential, supplementary and non essential variables. The WPS is now a work instruction and can be used as is to provide information to the welder/welding supervisor on the variables for the production welding. The welder(s)/welding operator(s) is/are qualified for a range of variables, mind it that the welder essential variables are diffferent as compared to those for a PQR. He is /They are tested to requirements as per specification and code(Normally lessesr tests as compared to the PQR- In some cases only NDE would suffice for a welder qual) and then a WPQ/WPQs is generated. A PQR has no age or time limit for use(at least as per both ASME Section IX or AWS D1.1), so even if the PQR qualified to a 1960 edition it would still be valid with all the changes in code. However a WPS has to be generated to the latest revision or the revision of the code agreed between the manufaturer and the buyer at the time of signing the contract. However a WPQ has got a validity period as can be expected since it is a test of the welder performance. Thus a continuity has to be maintained for the welder as per code or specification to show the welder has been continuously using that process.

how we can check of any kitchen exhaust fan

2 Answers  

---

in power plant which pump is used for feeding the water a) centrifugal pump or b) reciprocating pump and why?

6 Answers  

---

How curvature effect is consideed in spring design?

1 Answers  

---

how to handle manpower in production department ?

7 Answers   Jakraya Sugar,

---

how to implement spc. why we need spc?

6 Answers   Sona, TCS,

---

why there was 17 stage of compressor in the most of the gas turbine . depending on what?

0 Answers   TATA,

---

what is the use of offset follower in cam? why and where we have to use this type of follower?

6 Answers   College School Exams Tests, Ispat, Jawaharlal Nehru Technological University JNTU, Tata Motors,

---

What kind of paper airplane flies the farthest?

0 Answers  

---

Give one example of metal classified as per structure as bcc, fcc, hcp and ccp.

0 Answers  

---

Dfine an ortographic drawing?

0 Answers  

---

what is 15w-40grade oil. means what 15,W,40 stands for?

2 Answers   Total,

---

you did b.tech why u r intrested marketing field ?

0 Answers  

---