DEVELOPMENT OF AUTOMATIC QUALITY CONTROL FOR RESISTANCE WELDS IN ALUMINUM ALLOYS. PHASE I A STUDY OF THE CHANGE IN WELD ZONE RESISTANCE IN SPOT WELDING ALUMINUM ALLOYS
Abstract
The study of resistance spot welding of several commercial Al alloys using 3 phase power supply showed a correlation between the weld zone resistances and the weld nugget development. A 3-phase frequency converter spot welding machine with pulse counting timing was used. Spot weld tests on 0.020 in. 2024, 2014, 7075, 5052, and 0.025 in. 5086, and 0.050 in. 2024, 2014, 7075, 5086, and 5456 alloys with recognized welding schedules were made to study the resistance-time characteristics of each material. The electrode tip voltage and weld current were selected and measured for each weld. Weld test showed the weld nugget was formed after one or two pulses of weld current. The weld zone resistance-time graphs showed the resistances decreased continuously during weld time. The effect of welding variables on the weld zone resistance and weld size was the main objective. The weld time affected the final resistance to a greater extent than the reference resistance for a given weld schedule. The longer weld times produced a lower final resistance.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 20, 1962
- Accession Number
- AD0273477
Entities
People
- Richard P. Hurlebaus