Steel Welding
Specimen Preparation (Class 5 Procedures)
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Welding is the process of joining two or more pieces of metal together. The process can use filler materials to aid in the welding process. Since the welding process involves metaling and fusing the metals, the microsctructure and orientation and positioning of the weld are important metallurgical features that often require sampling to control the quality of the production process. Microstructural preparation and analysis of welded parts is relatively simple and use basic metallographic procedures.
SECTIONING
MAXCUT Abrasive blade (Cat. No. MAX-A or MAX-D series)
MOUNTING
Compression Mounting with Phenolic, Epoxy or Diallyl Phthalate compression mounting resins (if required)
POLISHING
| Abrasive/surface | Lubricant | Force/ sample | Speed (Head/base) |
Time | Individual Force mode |
Central Force mode |
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| 120 grit SiC paper* 240 grit SiC paper* |
Water | 5-10 lbs | 200/200 rpm | Planar 1 min |
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| 360 grit SiC paper 600 grit SiC paper 800 grit SiC paper 1200 grit SiC paper |
Water | 5-10 lbs | 200/200 rpm | 1 min 1 min 1 min 1 min |
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| 1 um DIAMAT diamond on GOLDPAD polishing pad |
DIALUBE Purple Extender | 5-10 lbs | 200/200 rpm | 2 min | |
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| 0.05 um Nanometer alumina on TRICOTE polishing pad |
5-10 lbs | 100/100 rpm | 30 sec | |
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*Required for central polishing force. Click here for more information on central vs. individual polishing force polishing.
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| Perfect Weld |
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| Carbon Steel Weld, Mag. 50X, 2% Nital etch. |
ETCHING
Common Etchants
CAUTION:Safety is very important when etching. Be sure to wear the appropriate protective clothing and observe all WARNINGS on chemical manufacuters SDS (Safety Data Sheets). Also review the COMMENTS and CONDITIONS Section for each etchant.
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