Work hardening steelgrades

If you have done much silver work, then work hardening the silver is something you are probably familiar with. Work hardening is when you have beat, bent, stretched, folded, etc the silver so much that it has lost its flexibility or workability. One example I will give here is I have a piece of shanking material that is too thick, I could solder it as is, but then I would spend a lot of time filing and grinding the metal to size, so in this instance, I roll the piece through my rolling mill to thin the metal to the size I want.

Strainhardening

If you have ever worked metal before, you know that as you work the metal, the characteristics of the metal change. This is a post from a while back, but I thought it was worth revisiting for old times sake. So sit back, take 2 minutes out of your busy schedule and follow me.

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Work hardeningprocess

You will want to turn off your bench light so you can see the metal change colors better. Apply your nice bushy flame to the silver and watch it. Do not get it too hot too fast. Move your flame back and forth and watch the metal for changing color. You want to try to get the silver to change to a very dull pink color. Try to keep that color for 30 seconds or so by moving the heat away and brushing the flame over again. DO NOT get the silver to a glowing red color. If you do this, quench the silver in water and start the process over again.

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The baking soda will neutralize the acid from the pickle and keep from getting on your hand, tools, bench, etc. Always use baking soda/water after your pickle. After that, then dip in clean water.

Strainhardeningvswork hardening

What iswork hardening inEngineering

Great! Now I have the shank to the size I want, but for some reason it is very stiff and hard to work. What I have just done is “Work Hardened the metal. Here is a quick science lesson….. What has happened to the metal is the molecules in the silver, which used to be uniform (and happy), have now been flattened and deformed (and stressed). What must be done now is a process called annealing. Annealing is heat treating the metal and rearranging the molecules in a way that makes them less stressed and happy again. (ok, so I am not real scientific).

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Work hardeningexamples

Leave it in your pickling solution (I use Sparex) for a few minutes, remove with Copper Tongs (or plastic tongs). Never use steel tools to remove metal from pickle, it will destroy the solution and you will notice your silver will start to turn pink….. the solution will start to react with the copper alloy in the sterling, turning your silver pink. If this starts to happen, change your pickling solution.

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Work hardening in steelformula

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After a few minutes, remove the silver from the solution, and dip in a mixture of water and baking soda( available at your local grocery store. (approx 1 oz. (shot glass) to 2 cups of water)

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