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welding ar 400 plate

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  • welding ar 400 plate

    can ar 4oo plate 5/16-or 3/8 be welded with a wire welder using 75-25 mix gas

  • #2
    Originally posted by right handed View Post
    can ar 4oo plate 5/16-or 3/8 be welded with a wire welder using 75-25 mix gas
    What are you going to do?

    AR 400 armor-plate is generally welded with a low-hydrogen electrode, pre-heat, post-heat, peening,and carefully controlled inter-pass temperature, to maintain abrasion resistance and hardness.

    If you are repairing mining or construction equipment, you will need the proper flux-cored or metal cored wire, as well. Gas may be different or may not be required.

    Welding instructions are often available from steel suppliers or machinery manufacturers. If you are using it for non-critical purposes, where failure consequences are minor, some of the above may not be as important.
    Last edited by Northweldor; 02-02-2016, 04:17 PM.


    • #3
      Certainly! AR400 is a high-hardness, abrasion-resistant steel plate that's often used in wear applications. Welding AR400 can present some challenges due to its high strength and potential for hardness in the heat-affected zone. However, it is weldable by using the right practices and materials. Here's a brief guideline:
      1. Base Material: When welding AR400, it's important to know the exact composition and grade of the material to ensure you select the right filler material and employ proper welding practices.
      2. Filler Metal Selection: Often, low hydrogen electrodes, such as E7018 sticks or ER70S-6 solid wires, are recommended for welding AR400 plate. These are common choices for carbon steel materials.
      3. Gas Mixture: A 75-25 mix (75% argon and 25% carbon dioxide) is commonly used for welding carbon steel and should work fine for AR400. This gas mixture provides good arc stability and reduced spatter compared to 100% CO2.
      4. Preheat and Interpass Temperatures: Preheating AR400 plate can help reduce the risk of cracking in the weld and heat-affected zone. The specific preheat temperature can vary based on the thickness of the material and other factors. For the thickness you mentioned (5/16" or 3/8"), preheat temperatures of at least 200°F to 300°F are commonly recommended. Interpass temperature should also be monitored and kept below a certain threshold (often around 400°F) to prevent hardness issues in the heat-affected zone.
      5. Post-weld Heat Treatment: Depending on the application, some AR400 weldments may benefit from post-weld heat treatment to relieve stresses or achieve desired hardness levels. However, this isn't always required.
      6. Technique: Be sure to clean the base material of any contaminants, oils, or scales. Use stringer beads and avoid excessive weaving. This will minimize the heat input and reduce the risk of issues like cracking.
      7. Welding Parameters: Adjust your voltage and wire feed speed accordingly to ensure a stable arc and proper penetration. Follow manufacturers' recommendations when available.
      8. Post-weld Inspection: Always inspect welds for cracks, porosity, or other defects. Non-destructive tests like ultrasonic or dye penetrant inspections can be useful.

      While the above provides a brief overview, it's essential to refer to welding procedures or consult with a welding engineer when dealing with specialized materials like AR400.