【正文】 H:\wenkuwenkub\wenkubdata\File_Temp\20228\18\d3e4d300f414461c8f5857918789f48b\ Page 1 of 61Questionnaire and Answer Sheet: MECHANICAL GENERAL 1 機械綜合 1 1. What is the purpose of a perameter or IQI?Indicates radiographic sensitivity and quality of the techniques.To find the smallest defect.2. What is meant by the term sensitivity with regard to radiography?The ability of a radiographic technique to reveal defects of a specific size.3. What are the limitations of magic particle inspection and liquid perant inspection?. can be used only on ferromagic materials to detect surface subsurface discontinuities.. can be used to detect defects open to the surface.Both . and . require surface preparations before testing.1) magic material2) surface and sub surface3) Surface finish(scale oil )4. What information is contained in a Welding Procedure Specification?Process type, groove (joint) design, material type, material thickness, position of groove, filler metal type, preheat requirements, interpass temperature, post weld heat treatment requirements, shielding gas or flux type, electrical characteristics, techniques of welding. Essential and nonessential variables.5. Why is post weld heat treatment required for some type weldments?Relieve stresses, adjust hardness 6. What is the basic difference between a DIN and an ASME perameter?DIN perameter has a wire type perameter, 7 wiresASME perameter is a wire type perameter. 6 wires7. What type of defects would you expect to find during visual inspection of a pleted weld?Undercut, excessive or insufficient weld reinforcement, lack of peration, lack of fusion, porosity, slag inclusion, cracks, weld spatter, etc. inplete peration on a single buttweld, weld spatter, etc..8. What precaution must be taken with low hydrogen welding electrodes?Store in oven when not in use, kept in heated container by welder awaiting use.9. What information normally appears on radiography?Perameter identification, Location of markers to ensure plete coverage, the name of the inspecting laboratory, the date, the part number, whether original or subsequent exposure.10. What is the code require amperage for the dry, prod method of magic particle inspection?90110 amps/inch for 19mm100 – 125 amps / 19mm11. What materials are the transducer (search unit) (crystal) made from?Quartz, Barium Titanate, Lithium Sulphate and Ceramics.Page 2 of 6112. What is a film defect (artefact)?A mark on the film usually caused by improper handling or processing.Artefact, water mark, finger print, any bad operation.13. If you were inspecting an item using the prod method and located a weak crack pattern, where would you place the prods to obtain a stronger location?Relocate prods 90 degrees to the crack pattern and reinspect.14. What typical defects would you expect while inspecting a casting?Sand and slag inclusions, gas porosity, shrinkage, hot tears.15. Describe the pulse echo technique.When an electric current is applied to the crystal, the crystal vibrates transforming the electric energy into mechanical vibrations which are transmitted through a coupling medium into the test material as high frequency sound waves. These pulse vibrations propagate through the object and are reflected as echoes from both discontinuities and the back surface of the test piece and will appear as a vertical deflection on the cathode ray tube or oscilloscope.The prob make sound wave, though the material, reflect by the wall amp。 defect, and indicate on the sceen.16. Which method . magic particle examination or liquid peration examination, locate nonmetallic inclusions open to the surface.Both.17. What is a “Procedure Qualification Record?Listed are the “essential variable” of the specific process of processes. It is a record lf the parameters of the test weld.It supports the range of values on the WPS.18. What is meant by the term “Film Density”?Measurement of film 。Densitometer is used to measure film darkening. 顯像密度計是用于測量膠片的暗色變化。19. What factors determine the echo height of a flaw in ultrasonic inspection?Size of the flaw, its type, position or orientation and instrument characteristics.20. What surface preparation is required on a material before magic particle or liquid perant inspection?The material surface should be clean, dry and free from oil, grease, weld spatter or anything that will obscure or interfere with defect detection. Clean 1” from each side.Questionnaire and Answer Sheet: MECHANICAL GENERAL 2 機械綜合 2 1. What is a mil?“Mil”是什么？1/1000 inch, ” or .2. Difference between stress relieving and normalising.1) Stress relieving was not to refining the grain structure, but normalising dose.2) Stress relieve dose not alter mechanical property of material, but normalising dose.Page 3 of 613. Name 2 tests carried out to determine toughness.., CHARPY impact test.4. What is max. hardness valve as per NACE MR 0175?Low carbon steel 235 Hv max. (21 HRC max) 鋼 最大： 235 Hv5. How would you measure gramophone lines (水線) on a raised face of a flange?Depth guage.6. Name 3 types of flanges face.Plain face, Raised Face, RTJ.7. What precautions must be taken when welding cladded pipe?Check angle, Prep etc. when welding ensures slag is removed and freed of beads etc.8. What info is required on a standard mill cert?Cast number, Chemical Analysis, Mechanical property test result, . Number, Client. Test Results etc.9. Why is radiography preferred over other . methods?Permanent indications on SPAM.RT give a record.Questionnaire and Answer Sheet (MAGNETICAL PARTICLE TESTING) 磁粉檢驗1. Can heat have an eff