Step how to make Welding Procedure Specification
Step how to make Welding Procedure Specification
Below step by step how to make Welding Procedure Specification:
1. Drawing
Check the existing drawing. Check the type of material used in the welding process and included in the group (Group I, II, III, IV). Metal material type / base used refers to the code, the code used must be the last edition. sample used AWS D1.1. For metals, AWS D1.1 Table 3.1 standards used. Check the thickness of the material, joint preparation, the common position of mixed type. Check weld symbol used to determine the edge preparation, mixed type to Angle (Angle Groove).
2. PWPS (Preliminiary Welding Procedure Specification)
Materials information contained in the drawings in public works programs. In a letter to public works programs have a head that contains: Project name, number of forms, documents no., revision no., support for PQR no., date, page No, PWPS no.
For the design of the board should be developed and wrote the material thickness, the angle of the slot away from the root, the root and the face has been described as the welding sequence as well.
Check the electrical parameters such as amplifier and Voltage Range (root, hot, filling, capping), polarity, ground speed, the heat input.
Check supplies, i.e. the type, class, AWS specification, the size of the electrodes (electrode diameter).
Check the welding process, namely the Common Position, secondary (root, hot, filling, capping), do not pass welding.
To supply the information that has been written according to the welding process, Flux uses, Shield Gas, Flow Rate, Back Purge, Stick Out (root), Stick Out (fill), Consumable Treatment.
Electrode numbering included: Electrocde No, Nozzle Diameter, Wire Feeder.
Heat treatment, which is a description: Preheat, Temperature Check Methode, Max Interpass Temperature. Post Weld Heat Treatment(PWHT): thickness, temperature and time.
After the procedure the column should be, among others: elaboration, comments, Approved, Customer Representative (Part 3)
Technical: Rating position, increasing the welding refers to the AWS D1.1 Table 4.1
NDT: test methods used visual inspection, MPI, DPI, RT, UT reached 100% standard AWS D1.1 Table 6.1
For the mechanical tests, Test Method for Tensile, root Bend, side Bend ,face bend as per AWS D1.1 Table 4.2
3. Welding as per PWPS (Preliminiary Welding Procedure Specification)
These public works programs of the data used to guide the welding process. All data contained in the welding process is stored Procedure Qualification Record(PQR). Ampere and voltage range obtained in the process of welding the root, hot, filling, capping must be recorded. Also, the travel speed, heat input, electrode diameter should be recorded.
4. Welding Inspection:
a. Visual inspection, conducted 100% record at PQR, if the data to accept or reject, according to AWS D1.1 Table 6.1
b. NDT : MPI (carbon steel), DPI (stainless steel), RT, UT. All data should be recorded at PQR, accept or reject according to AWS D1.1 Table 6.1.
Then perform the mechanical test, the standard used by AWS D1.1 Table 4.2. Representative clients for its implementation should be witness.
The results should be recorded accept or reject the PQR. If, therefore, accept the results of the weld is considered good, then you should do if Reject retest or repair. If the test result actually reject the welding process must be repeated.
After visual inspection, non destructive testing(NDT), test results that meet Mechanical and use can be prepared for the WPS and must be approved by stakeholders.
Mechanical testing usually refers to the client if the client has requested an additional test machine then you should do, even if not contained in the standard specification for customers is the highest level.
If the customer requests Spec hardness test macros are usually carried out and the two online tests.
5. Accept the PQR data is ready for WPS.
The welding Procedure Specification (WPS) has a header that contains: Project Name, Form No, Document No, Revision No, Supporting PQR No, Date, Page No, WPS No, Material Spec.
6. After all data are true and approved by the clients and 3rd party, then the PQR become approved WPS.
reference: http://hazwelding.wordpress.com
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