welding technologyWednesday, 22 August 2012CSWIP 3.1 MODEL 5www.bitndtindia.com1 An essential variable may:

a)Change the properties of the weldb)Influence the visual acceptabilityc)Require re-approval of a weld procedured)All of the above

2 A magnifying glass may be used during visual inspection but BS 5289 states that its magnification should be:a)Up to 5b)2 2.5c)5 10d)None of the above

3 When visually inspecting a fillet weld, it would normally be sized by:

a)The leg lengthsb)The actual throat thicknessc)The design throat thicknessd)Both A & C

4 The planar defect is:

a)Incomplete fusion defectsb)Slag inclusionc)Incomplete penetrationd)Both A & C 5 Penetrant and Magnetic particle inspection are mainly used to:

a)Aid visual inspectionb)Because application standard says soc)To confirm visual uncertaintiesd)All of the above

6 Defects outside of the limits specified in a standard should always be:

a)Repairedb)Reported to a senior personc)Assessed along with other defectsd)All of the above

7 MIG welding tends to be susceptible to lack of fusion problems. This is because of:a)Poor maintenance of equipmentb)Incorrect settingc)Poor inter run cleaningd)All of the above

8 Manual metal arc electrodes can be grouped into three main types. These are:

a)Basic cellulosic and rutileb)Neutral cellulosic and rutilec)Basic cellulosic and neutrald)None of the above

9 The main causes of porosity in welded joints are:

a)Poor accessb)Loss of gas shieldc)Dirty materialsd)All of the above

10 Weave technique may give rise to:

a)Better profilesb)Improved toe blendingc)Improved ripple shaped)All of the above

11 Cracks in welds may be due to:

a)Solidification problemsb)Hydrogen problemsc)Excessive stressesd)All of the above

12 With reference to a root penetration bead, you could certainly assess:

a)Root fusion and penetrationb)Root concavityc)Burn-throughd)All of the above

13 A fatigue failure characteristic by the appearance of the fracture surface. It would be:a)Rough and tornb)Cheveron likec)Smoothd)None of the above

14 Stray arcing may be regarded as a serious defect. This is because:

a)It may reduce the thickness dimension of a componentb)It may cause liquation cracksc)It may cause hard zonesd)All of the above

15 Overlap in welds could be influenced by:a)Poor welding techniqueb)Welding processc)Welding positiond)All of t he above

16 Flame cut preparations may, during welding, increase the likelihood of:

a)Crackingb)Misalignment problemsc)Inclusionsd)All of the above

17 Macroscopic examination requires any specimen to be inspected:a)Once, after etchingb)Twice, before and after etchingc)Using a microscoped)None of the above

18 Which of the following may be classes as a more serious defect?a)Slag inclusionsb)Fusion defects (interun)c)Fusion defects (surface)19 Code of practice is:

a)A standard for workmanship onlyb)A set of rules for manufacturing a specific productc)Levels of acceptability of a weldmentd)None of the above

20 Movement of the arc by magnetic forces in-MMA welding is termed:

a)Arc deviationb)Arc misalignmentc)Arc blowd)Arc eye

21 A metallurgical problem most associated with submerged arc welding is:

a)Hydrogen cracking in HAZb)Solidification cracking in the weld metalc)Hydrogen cracking in the weld metald)Lamellar tearing in the weld metal

22 Oxy pressure and nozzle size would influence what in flame cutting:

a)The temperature required for cut initiationb)The ability to cut stainless steelsc)The depth of cut obtainabled)None of the above

23 The main uses of arc cutting/gouging processes are in:a)The cutting of single bevel preparationsb)The removal of deposited weldsc)The cutting of single U-type preparations

24 Which of the following processes joins metals plastically?

a)Friction weldingb)Resistance weldingc)Plasma weldingd)All of the above

25 Which electrode classification would be relevant AWS A 5.1-81?

a)E 6013b)E 5133c)E 7018 Gd)Fleet weld 526 Which of the following coating is associated with Stove welding?

a)Rutileb)Cellulosicc)Basicd)Oxidizing

27 A common gas mixture used in MIG welding nickel alloys to combine good levels of penetration with good arc stability would be:

a)100% COb)100% argonc)80% argon 20% CO2d)98% argon 2% oxygen

28 The type of SAW flux is more resistance to moisture absorption:

a)Fusedb)Agglomeratedc)Basicd)All of about the same resistance

29 The flame temperature of oxy/acetylene mixture gas is given as:

a)3200Cb)2300Cc)5000Cd)None of the above

30 A large grain structure in steels is said to produce:

a)Low ductility valuesb)Low fracture toughness valuesc)High fracture toughness valuesd)High tensile strength

31 The likelihood of brittle fracture in steels will increase with:

a)A large grain formationb)A reduction of in service temperature to sub zero levelsc)Ferritic rather than austenitic steelsd)All of the above

32 Repair welding is often more difficult than production due to:

a)The material being ingrained with in-service contaminatesb)Restricted access with the repair areac)The possible position of the weldd)Any of the above

33 Hydrogen cracking in the weld metal is likely when:

a)Carbon manganese steelsb)Stainless steelsc)Micro alloyed steels (HSLA)d)Low carbon steels

34 EN standard 288 would refer to which of the following:

a)Welder approval testingb)Welding equipmentc)Welding procedure approvald)Consumables for submerged arc welding

35 Porosity is caused by:

a)Entrapped slag in the solidifying weldb)Entrapped gas in the solidifying weldc)Entrapped metallic inclusions in the solidifying weldd)None of the above

36 In bend test, the face of the specimen is in tension and root is in compression; the type of test being carried out would be:a)A root bend testb)A side bend testc)A face bend testd)None of the above

37 Ultrasonic testing is of advantage in detecting which of the following weld imperfections over other NDT methods:

a)Lack of side wall fusionb)Surface undercutc)Incompletely filled grooved)Overlap

38 The process of tempering is often carried out to regain toughness after which of the following processes:

a)Annealingb)Normalizingc)Hardeningd)Stress relieving

39 The presence of iron sulphide in the weld metal is most likely to produce which of the following upon contraction of the weld:

a)Solidification crackingb)Hydrogen crackingc)Intergranular corrosiond)Stress corrosion cracking

40 Generally the most suitable method of detecting lack of sidewall fusion would be:

a)Ultrasonicb)MPIc)Radiographyd)Penetrants

41 Hot shortness term is used to indicate:

a)Lamellar tearingb)Solidification crackingc)Hydrogen crackingd)None of the above