Interview Questions and Answers | Welding Interview Questions

Posted on July 28, 2016

Interview Questions and Answers

Q:- What is the standard for Process (or) Plant piping systems?
Answer: ASME B 31.3

Q:- What is the standard for Power Piping systems?
Answer: ASME B 31.1

Q:- What is the standard for liquid Petroleum Transportation piping systems?
Answer: ASME B31.4

Q:- What is the standard for Gas Transmission and Distribution piping systems?
Answer: ASME B31.8

Q:- What is the Code for Welding of Pipelines and Related facilities?
Answer: API 1104

Q:- What is the standard for welding rods Electrodes and filler metals?
Answer: ASME Sec-IIC

Q:- What is the standard for Non-destructive Examination?
Answer: ASME Sec-V

Q:- What is the standard for welding and Brazing Qualifications?
Answer: ASME Sec-IX

Q:- Which type of process we are using in field/fabrication shop?
Answer: Fusion welding

Q:- What is the specification/classification for carbon steel filler wire?
Answer: AWS 5.18/ER70-Sx

Q:- What is the specification/classification for carbon steel Electrode?
Answer: AWS 5.1/E-XXXX

Q:- Where we can use E-6010 type electrode?
Answer: we can use at root pass for deep penetration

Q:- What is the meaning for ASME?
Answer: American Society for Mechanical Engineering

Q:- Which type of electrode we are using in GTAW process?
Answer: Non-Consumable Tungston Electrode

Q:- How Many times we can dry the electrodes?
Answer: Only one time

Q:- Why we are baking the electrodes?
Answer: To remove the moisture content from the Electrodes.

Q:- What is the standard for Structural steel fabrication?
Answer: AWS D1.1

Q:- What is the standard for Welding symbols?
Answer: AWS A2.4.

Q:- What is the hydrotest pressure?
Answer: 1.5 Times of design pressure.

Q:- What is the drying temperature for Stainless Steel electrodes?
Answer: 120 to 250 degree temperature.

Q:- What is the drying procedure procedure for Low hydrogen electrodes?
Answer: 260 to 430 degree temperature.baking for two hours

Q:- What are the defects we can find in visual Inspection?
Answer: Porosity,Undercut,Surface crack (HIC),Side wall fusion on fusion boundary.

Q:- What is the Procedure for Fit-Up inspection?
Answer: Base metal classification,cleaning,Alignment,root gap,root face,bevel angle & mismatch (or) overlap.

Q:- What is the internal overlap (or) mismatch for piping?
Answer: 1.5 mm.

Q:- How much root face are allowed?
Answer: As per WPS (or) 0.8 to 1.6 mm

Q:- What is meaning for F – Number?
Answer: F- is filler metal grouping Number.

Q:- What is meaning for P – Number?
Answer: P – is base metal grouping Number.

Q:- What is meaning for A – Number?
Answer: A – is electrode chemical analysis number.

Q:- How much bead width we can allow?
Answer: Max 3 times of electrode diameter.

Q:- How much area is required for Pre-heat?
Answer: 75 mm minimum from both end of the Joint.

Q:- Which section we are using for NDT?
Answer: ASME Sec-V

Q:- What are the essential variables for SMAW process?
Answer: In base metal thickness, P-number, dia of pipe, pre, post weld heat treatment
In filler metals F,A-numbers, dia

Q:- What are the essential variables for GTAW process?
Answer: In Base Metal thickness, P-number, dia of pipe, pre, post weld heat treatment… In Filler Metals F, A-numbers,dia of filler metal

Q:- If welder made test by 2’’ dia, what is his range qualified?
Answer: He has qualified 1’’-dia and above.

Q:- If welder made test by 14 mm thickness, what is his thickness range qualified?
Answer: He has qualified unlimited thickness.

Q:- What is carbon % in low carbon steel?
Answer: Max 0.30 %

Q:- What is the interpass temperature for carbon steel materials?
Answer: Max 315’C

Q:- What is meaning for SAES,SAEP and SAMSS?
Answer: Saudi Aramco Engineering Standards
Saudi Aramco Engineering Procedures
Saudi Aramco Materials System Specification.

Q:- How much under cut depth allowed in piping?
Answer: 0.8 mm

Q:- How much area is required for Pre-heat?
Answer: 75 mm minimum from both end of the Joint.

Q:- How much percentage is allowed more than test pressure in Pressure relief device?
Answer: Test pressure plus10% (10% should be lesser than 50Psi).

Q:- How much gap is allowed in socket weld?
Answer: 1.5 mm minimum before welding.

Q:- What is the minimum fillet size in socket weld?
Answer: Minimum 3 mm fillet size.

Q:- Hydro test.
1. Piping Internal Cleaning
a. Air compressor
b. Air blower
c. Electrical cable
d. Generator
c. Wire brush
d. cotton waste cloth
e. water tanker water with pump
2. Testing
a. Pressure gauge-(30days calibration valid, range 1.5 to 2 times test pressure)
b. Test manifold (calibration validity)
c. Pressure relief valve( Set to 5% above test pressure)
d. Test pump
e. Water tank
f. Hoses
g. Test blind
h. Test water (refer as per project specification)
II. Test package
1. Calibration Certificates of Gauges ,relief valves
2. P&ID and ISO Drawing
3. Test Package Control sheet
4. Marked up P&ID
5. As built Drawing
6. Welding log
7. NDE report
8 .Punch list –all punch list cleared (category one)
9. Pressure test Check sheet
10. Safety check lists

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