Home > Quality Control

Site Search

Quality Control

Print PDF
SHARE STORY:
Digg
http%3A%2F%2Fpolarisindia.co.in%2Findex.php%2Fquality-control
 

Quality Assurance Plan (QAP) is the specified quality plan which should be adhered to while manufacturing a particular product.

 

Stages of Quality Assurance Plan (QAP) for steel bridge fabrication are mentioned hereunder in a generalised and concise manner.

 

1. RAW MATERIALS (Steel Structural Sections and Plates)

i ) Identification & Co-relation with Mill Test Certificate

ii) Ultrasonic Test of Plates.

iii) Tensile Test & Chemical Analysis from reputed Test House/ Laboratory.

 

2. WELDING CONSUMABLE (From approved vendor)

i) Verification of Supplier Test Certificate.

 

3. FASTENERS

i) Verification of Supplier’s Test Certificate.

ii) Physical, Mechanical & Chemical Test from reputed Test House/Laboratory

 

4. PAINTS

i) Verification of Supplier’s Test Certificate.

 

5. PQR & Welder Qualification Test

i)  Preparation of Welding Procedure Specification (WPS) & its qualification by Testing & Welder Qualification Test &  to form Procedure Qualification Record (PQR) Documents.

ii) Welder’s Performance qualification as per Qualified PQR.

 

6. MANUFACTURING PROCESS (Preparatory Work)

i) Marking, Flame cutting, Straightening, bending, drilling, machining, drilling jig &    fixture    & templates etc.

ii)   Dimensional layout, checking of Cambered length as per approved drawing.

 

7. FIT UP

i) Dimensional & Alignment Checking as per approved drawing.

 

8. Post Weld Inspection

i) Proper welding sequence to be adopted to avoid distortion of structural components.

ii) Post welding inspecvtion involves visual & non-destructive testing (DPT, MPT, RT / UT)

 

9. Drilling of Holes

i) All members should be drilled preferably by drilling jigs, approved by the Inspection Agency.

 

10. TRIAL ASSEMBLY

i) Dimensional checking, hole matching, Checking of no-load/Dead load Camber geometry & alignment checking as per approved drawing.

 

11. PAINTING (Surface Preparation)

i) Sand Blasting/ Buffing

ii) Measurement of Dry Film Thickness of Paint Coating.

iii) Prominence & Correctness of Match Marking

 

General Remarks :

Quantum of checking, reference documents / relevance specifications & drawings, acceptance criteria, etc. should be mentioned against each of the above items as per the contract documents / specifications.