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    • Engineering Services >
      • Pressure Vessel Design
      • Vacuum Chamber Design
      • Cryogenic System Design
    • Machining Services >
      • CNC Milling
      • Lathe Turning
    • Welding Services >
      • ASME Code Welding
      • Aluminum Welding
      • Brazing and Soldering
      • Precision Welding Services
    • Assembly / Testing Services >
      • Helium Leak Testing
      • Pneumatic Pressure Testing
      • Hydrostatic Pressure Testing
      • Electrical Wiring / Sensor Testing
      • Cold Shock Testing
      • Precision Cleaning
      • Dye Penetrant Testing
  • Products
    • Vacuum Products >
      • Custom Vacuum Chamber >
        • Custom Aluminum Vacuum Chamber
        • Custom Stainless Steel Vacuum Chamber
        • Custom Exotic Material Vacuum Chamber
      • Custom Combination Pressure and Vacuum Chamber
    • Pressure Products >
      • Custom ASME Code Pressure Vessel
      • Non ASME Code Pressure Vessels
      • Custom ASME B31.3 Piping Systems
    • Cryogenic Products >
      • Custom Cryostats / Dewars >
        • Custom Aluminum Cryostats / Dewars
        • Custom Stainless Steel Cryostats / Dewars
      • Custom Cryogenic Distribution Boxes / Cold Boxes
      • Custom Heat Exchangers
      • Custom Cryogenic Thermal Shrouds and Shields
    • Machined Products >
      • Precision Mechanical / Electrical Assemblies
      • Custom Precision Machined Parts
      • Radio Frequency Components
    • MLI - Multi Layer Insulation
  • Experience
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      • Oil and Gas Industries
      • Aerospace Industry
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      • Coatings Industry
      • Semiconductor Industry
      • Astronomy Telescope Industry
      • Engineered Diamonds Industry
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    • Customer Testimonials
  • Learning Center
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      • Newsletter Signup
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Call: 708-425-9080

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Cold Shock Testing

Thermally Stressing Weld Zones

Cold shock testing is performed after welding and before Helium leak testing.  Cold shocking is a way to thermally stress the welds and enlarge any potential voids or cracks in order to make them easier to detect during Helium leak testing.  The basic process involves flooding the weld zone with liquid Nitrogen so that the part rapidly cools down then allowing it to warm back up to room temperature.  In some cases a flame will be applied to rapidly warm up the weld and increase the amount of stress applied to the weld. Small parts can be totally submerged in LN2 while larger assemblies will have LN2 sprayed directly on the weld areas.  When fabricating products for vacuum service even the tiniest leak can become a major problem.  Aluminum welds are notorious for various weld defects like pitting and porosity so it becomes very important to stress the welds and increase the sensitivity of the leak test. 

Cold Shocking G10 Pressure Vessel

Spraying glue joints of a custom G10 pressure vessel with liquid nitrogen prior to a pressure test in order to thermally stress the joints

Submersion Cold Shocking of Weldments

Submerging weldments in liquid Nitrogen to cold shock and thermally stress the welds prior to leak testing

Cryogenic Distribution Box Feedthrough Cold Shocking

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Phone: 708-425-9080
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Address: 4601 W. Southwest Highway, Oak Lawn, IL, 60453
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