References

1. U. S. Patent 4,682,487 Method for reconditioning spot welding electrodes W. Kaeseler
2. IIW Doc Ⅲ-1088-97 Procedure for the evaluation of the life of spot welding electrodes using constant machine settings
3. Welding Conference Proceeding-Technology advancements and new Industrial Application in Welding Evaluation of electrode life and lobe curve for aluminum alloy 5000 Series Byung-Kil Choi;Byung-Hun Lee;Hee-Shin Kang
4. Sumitomo Light Metal Technical Reports v.35 no.3;4 Star electrode of resistance spot welding of aluminum alloy sheet M. Kumagai(외 3인)