Welding Interview Questions and Answers

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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.