1 / 23

Copper

Copper. Resistance Welding. Learning Activities View Slides; Read Notes, Listen to lecture Do on-line workbook. Lesson Objectives When you finish this lesson you will understand:. Keywords. Copper & Iron Sulfates. Copper Ingot. Electrolytic Refined.

yardley-pitts
Download Presentation

Copper

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Copper

  2. Resistance Welding • Learning Activities • View Slides; • Read Notes, • Listen to lecture • Do on-line workbook • Lesson Objectives • When you finish this lesson you will understand: Keywords

  3. Copper & Iron Sulfates Copper Ingot Electrolytic Refined Rosenqvist, Extractive Metallurgy McGraw-Hill, 1974

  4. Induction Furnace Melting

  5. AWS Welding Handbook

  6. AWS Welding Handbook The lower thermal & electrical conductivity materials are weldable Not Recommended Good Fair Excellent

  7. Welds can be made with sheets having 30% or less IACS No Welds with IACS over 60%

  8. Spot Welding Weld Force Weld forces are usually set to 50-70% of that used for the same thickness uncoated plain carbon steel

  9. Spot Welding Weld Current: Higher than for plain carbon steel Weld Time: Shorter than for plain carbon steel

  10. Spot Weld Experience with 65% Cu – 35% Zn Brass Increased Resistance Class 1 Class 2 Class 11 Excessive penetration Electrode Sticking Min Penetration Poor Electrode Life Increased Nugget Dia. Resistance Welder manufacturers Association Bulletin # 25

  11. Spot Welding Tungsten or molybdenum tipped electrode are preferred to minimize tip sticking Higher Resistance = Heat Soaking Lower Thermal Conductivity = Less Heat Loss

  12. More Spot Weld Experience with 65% Cu – 35% Zn Brass Cracks Under Load When Nugget Too Close to Edge Resistance Welder manufacturers Association Bulletin # 25

  13. Welding of Unequal Thickness Brass

  14. Seam Welding • Problems: • Shunting of Weld Current • High thermal conductivity • Low Electrical Contact Resistance • Result: • Limited Alloys Seam Weldable • Need Electrical Conductivity less than 30% IACS

  15. Flash Welding

  16. Flash Welding Rapid Upset Premature Interruption of Flashing Results in Low Temp & CL Defects Excessive Flashing will Overheat & Improper Upset Low Pressure at Start to get Platen Motion Immediately • Copper Characteristics: • Low melting temp • Narrow Plastic Range • Result • Rapid Upset at low force • Immediate & Full Flashing Required Savage, Flash Welding, Welding Journal March 1962

  17. Flash Welding Leaded Copper Alloys are limited to approximately 1% Lead

  18. High Frequency Welding Induction Coil HF HF HF Tube Butt Seam Tube Butt Seam Tube Mash Seam Nearly all Copper Alloys can by HF Welded - Tubing is a Popular Application

  19. Electro-Brazing

  20. Welds can be made with sheets having 30% or less IACS No Welds with IACS over 60%

  21. Electro-brazing W. Stanley, Resistance Welding McGraw-Hill, 1950

  22. Homework

More Related