Workflow of post processing of welding trials
1. Grinding and polishing of samples a.
All samples are ground in several steps; grain size became smaller with every steps. Depending on requirements of customer and type of application the samples also have to be polished.
b.
after each grinding and polishing step the sample and the grinding machine (for polishing also the polishing disc) have to be cleaned with water carefully.
2. Etching a.
For each material there is a special etching agent. For stainless steel (1.4301) Adler etching agent was used (contains hydrochloric acid), for aluminum Keller etching agent or sodium hydroxide solution was used
b.
Success of Etching always depends on residence time.
3. Microscopy
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