classification of steels heat treatment welding brazing soldering welding defects testing ndt - Question Bank
1. Which NDT method uses a dye that is applied to the surface of a part, allowed to penetrate into discontinuities, and then revealed by a developer?
2. In the classification of steels, what does the 'stainless' designation primarily refer to?
3. Which of the following is a heat treatment process that involves heating steel and then cooling it at a controlled rate to achieve a specific microstructure and properties, often resulting in a fine pearlite structure?
4. What is the main advantage of Gas Tungsten Arc Welding (GTAW) over Gas Metal Arc Welding (GMAW)?
5. Which NDT method is particularly effective for detecting surface cracks in non-magnetic materials like aluminum or stainless steel?
6. Which welding defect is characterized by a groove melted into the base metal adjacent to the weld toe or root, reducing the cross-sectional area?
7. What is the primary purpose of the flux in SMAW (Shielded Metal Arc Welding)?
8. Which heat treatment process involves heating steel to a temperature just above its upper critical temperature and then cooling it rapidly in a quenching medium?
9. What is the main difference between brazing and soldering regarding the filler metal?
10. Which of the following is a common application for soldering?
11. What is the primary advantage of using inert gases like Argon or Helium in TIG welding?
12. Which NDT method is commonly used to inspect welds for internal defects like porosity and inclusions and can also be used to measure weld thickness?
13. In the context of welding defects, what does 'lack of penetration' mean?
14. Which type of welding is often referred to as 'stick' welding?
15. What is the purpose of adding nickel to steel?
16. Which of the following is a characteristic of martensite, the microstructure formed during rapid cooling of steel?
17. What is the main purpose of adding chromium to steel?
18. Which heat treatment process is primarily aimed at increasing the hardness and strength of steel by forming martensite?
19. Visual Inspection (VT) is the most basic NDT method. What is its primary limitation?
20. Which NDT method is best suited for detecting subsurface voids or inclusions in a wide range of materials, both metallic and non-metallic?
21. Eddy Current Testing (ECT) is an NDT method primarily used for:
22. Liquid Penetrant Testing (PT) is a method used to detect surface-breaking defects. What is the primary principle behind this test?
23. Radiography Testing (RT) uses which type of radiation to detect internal flaws in materials?
24. Ultrasonic Testing (UT) works by transmitting high-frequency sound waves into the material and analyzing the:
25. Which Non-Destructive Testing (NDT) method uses magnetic fields to detect surface and near-surface flaws in ferromagnetic materials?
26. Lack of fusion is a welding defect where:
27. A 'crater crack' in welding typically occurs:
28. Which welding defect occurs when slag is trapped within the solidified weld metal, reducing its strength?
29. An undercut in a weld refers to:
30. What is a common type of defect in welding where voids or pores are trapped within the weld metal?
31. Which joining process is typically used for joining electronic components and electrical connections due to its low temperature and minimal risk of damaging sensitive parts?
32. Soldering is similar to brazing but uses a filler metal with a lower melting point. What is the maximum melting point for solder?
33. Which of the following is a key difference between brazing and welding?
34. Brazing is a joining process where the base metals are heated and a filler metal (braze alloy) is melted and flows into the joint by capillary action. What is the minimum melting point of the braze alloy?
35. Oxy-acetylene welding uses a flame produced by burning acetylene in the presence of which gas?
36. Which welding process is characterized by high heat input and deep penetration, often used for thick plates, and involves an arc shielded by granular flux?
37. Tungsten Inert Gas (TIG) welding uses a non-consumable tungsten electrode and requires a separate filler rod for most applications. What is the primary shielding gas used?
38. In Gas Metal Arc Welding (GMAW), also known as MIG welding, what provides the shielding for the molten weld pool?
39. Which welding process uses a consumable electrode coated with flux, which provides shielding gases and slag?
40. What is the main characteristic of welding as a joining process?
41. Case hardening (surface hardening) of steel involves creating a hard surface layer while maintaining a tough core. Which of the following is NOT a common case hardening method?
42. Which heat treatment process is primarily used to relieve internal stresses introduced during manufacturing processes like welding or cold working?
43. Normalizing is a heat treatment process that involves heating steel to a temperature above its critical point and then cooling it in:
44. What is the purpose of tempering a hardened steel?
45. The process of heating steel to a specific temperature and then quenching it in a medium like water or oil to achieve maximum hardness is called:
46. Which heat treatment process is used to soften steel, reduce hardness, and improve machinability by heating and slow cooling?
47. What is the typical carbon content range for low carbon steel (mild steel)?
48. Which type of steel is known for its high strength, hardness, and wear resistance, often used in tools and dies?
49. What is the primary alloying element that distinguishes alloy steel from plain carbon steel?
50. Which classification of steel is characterized by a carbon content typically between 0.02% and 2.1% by weight?