Below mentioned question is likely to be asked in interview & Welding/Quality Engineer should must prepare for these question before interview.
Q11. Why E9015-B91 preferred for P91 material welding instead of E9018-B91?
Ans 11 : You can weld P91 with both E9018 & E9015, But there is advantage in using E9015/16 instead E9018 as follows
CRATER CRACKING AND OTHER UNDESIRABLE GRAIN BOUNDRY PHENOMENA CAN BE MINIMIZED BY ORDERING WELD METAL WITH LOW RESIDUAL ELEMENT CONTENT.( X<15 AS APPLICABLE)
THE 15/16 COATINGS NORMALLY POSSES LESS IRON POWDER AND EXHIBIT LOWER RESIDUAL ELEMENT CONTENT. THESE ARE OFFERED TO REDUCE THE POTENTIAL FOR PROBLEMS THAT OCCUR AS A RESULT OF LOW MELTING CONTITUENTS OR OTHER PRECIPATES THAT INFLUENCE GRAIN BOUNDRY INTEGRIT
Q13. Why SAW AC welding is preferred over DC for P22 material?
Q17. Why E347 is preferred over E321 for welding of SS321 material?
Q19. What is hot-cracking and how it occurs?
Q20. Enlist the elements of austenite and ferrite former?
Q22. What is pull-out test in tube to tube sheet welding and what is acceptance criteria for same?
Q23. From which location impact sample shall be drawn as per ASME Section. IX?
Q24. What is DSS. Explain care to be taken for DSS welding?
Q25. Why Ni+Mn>1.2% is restricted in P91 & P92 materials welding?
Q26. Difference between synthetic and non-synthetic electrodes?
Q27. What is interpass temperature and how it affects the toughness property?
Q28. What is sensitization in stainless steel?
Q29. Why trailing gas used for titanium welding?
Q30. Specify some welding issue related to nickel alloys?
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