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How do you measure penetration in welding?
To measure penetration of a weld, one must cut and etch the weld, preferably on a test coupon. Etching is just using an acid that will discolor the weld metal so that there is a visible difference between the weld metal and the base metal. Once the acid has taken affect, one can measure the weld using calipers or a similar measuring device.
Safer ways to etch concrete?
www.superdeck.com/masonsselect/6550spec.htm www.healthyhome.com/products/2035/Eco-Etch-Gel-Concrete-Etch.aspx www.ippnet.com/EN/main/products/paints/5541/7401.html www.radonseal.com/cleaners/etcher.htm
What are some iconic inventions from 1960?
4 Notables: Etch a Sketch drawing toy Downy Fabric Softener CPR Technique Bubble wrap
How does etching reveal the crystal structure of metal?
Cristal are fundamentally anisotropic. They are geometrically organized in planes that are denser than other direction. When acid etch a crystal, it began where it's easier, by the planes directions where the atoms are the most distant from each other. This process highlight's the crystal planes.
Can ceramic tile grout on a counter top be sealed years after it was originally installed if it has never been sealed before?
Yes. But you would want to make sure it's immaculately clean first. Possibly etch with a slightly acidic grout cleaner. Follow instructions on grout sealer container.
