10 ms·

> The standard way to test material's resistance to molten salt is to put a coupon in a crucible full of salt for a few hundred hours. Q: What is a coupon in t

• iAm25626 4y ago
  Great Q: maybe? https://www.researchgate.net/figure/a-MAR-M247Nb-coupon-b-Al-2-O-3-crucible-c-coupon-crucible-used-for-the-isothermal_fig1_270394732 https://www.researchgate.net/figure/a-MAR-M247Nb-coupon-b-Al...
• djcapelis 4y ago
  A coupon is an informal term for a small sample of material, most often metal. It’s perhaps most commonly used in welding where practice welds for people first training to weld are done on pieces of metal often referred to as coupons. :) It is usually an artifact of materials like metal which are hard to cut, and can’t efficiently just be cut as needed during a task, but are prepared and pre-cut into small pieces you can grab easily. Each of those pieces is called a coupon. I used to store mine in a Chinese takeout container box.
  • greyhair 4y ago
    In the mid 1970s, in my welding class, the school was located down the street from a small manufacturer that formed various metal alloys. They would provide the school with bins of scrap from their manufacturing free of charge. Those were our practice coupons in class. We had to be careful to return the welded scraps back to the proper bin so the manufacturer could recycle them. Our class was just a very small part of their recycling flow. It was a great relationship, we needed practice materials, and they hired welders.
• ortusdux 4y ago
  It's used 2 ways in metallurgy. Mainly it is a term for test pieces cut from a batch of metal and used for proof testing. Tensile, elongation, fatigue, weldability, and many other tests require destructive testing coupons. When you take welding certification tests, you weld two coupons together, and then submit your coupon for testing. It is also a term for strips of metal that you mount in a corrosive environment as a way to monitor corrosion of other susceptible components. So if you were worried about your bronze bushings, you would buy some matching bronze coupons, put them in an area of similar flow, and measure their thickness periodically. https://www.alspi.com/coupons.htm https://www.alspi.com/coupons.htm https://en.wikipedia.org/wiki/Fatigue_testing#Coupon_tests https://en.wikipedia.org/wiki/Fatigue_testing#Coupon_tests
  • carlmr 4y ago
    >test pieces cut from a batch of metal >strips of metal I mean in essence you just have to look at the word. Coupon is from French couper, which means to cut. So it's a cut-out. It has the same meaning when you look at extreme couponing and metal testing.
    • ortusdux 4y ago
      Yeah, I didn't think of it as an overly obscure usage, but neither Merriam-Webster or Wikipedia list the definition. Dictionary.com does. Maybe its time to edit Wikipedia over lunch =)
• albrewer 4y ago
  Coupon is used in metalworking to mean a sample you can submit for destructive testing that is representative of the whole piece under test. A weld coupon, for example, is a piece of test material of the same thickness and weld preparation as the main part being welded but is not integral to the part itself. That coupon is then sawed off and submitted for destructive tests like impact testing (to determine minimum operating temperature), tensile strength testing (specimen is pulled apart to find how strong and stretchy it is), and crystallographic etching (looking at the crystal structure of the metal to see if it has defects).