Effects of pulse shaping on Nd:YAG spot welds in austenitic stainless steel
- Lumonics Corp., Livonia, MI (United States)
- Univ. of Waterloo, Ontario (Canada)
The effects of temporal pulse shape on weld dimensions and weld quality of Nd:YAG laser spot welds produced in AISI 304 stainless steel have been examined over a range of power densities and pulse times. Four different temporal pulse types were used: normal rectangular'' pulses with a characteristic leading-edge power spike, rectangular pulses with no spike, ramped-up pulses and ramped-down pulses. Pulse shaping had no significant effect on the weld dimensions or weld quality of the conduction-mode welds. Removal of the leading-edge power spike from rectangular'' pulse shapes tended to reduce the weld diameter and crater area of keyhole-mode welds, but had little effect on other measures of size or quality. However, the diameter, penetration and melt area of keyhole-mode welds made with ramped-up or ramped-down pulse shapes were consistently greater than those made with the rectangular pulse shape. Also, the penetration and melt area of keyhole-mode welds made with the ramped-up pulse shape were greater than those made with the ramped-down pulse shape. Keyhole-mode welds made with ramped-up pulse shapes had the greatest occluded gas porosity, but the smallest crater areas. Alternatively, welds made with the ramped-down pulse shape exhibited the least porosity, but the greatest crater areas.
- OSTI ID:
- 7105375
- Journal Information:
- Welding Journal (Miami); (United States), Journal Name: Welding Journal (Miami); (United States) Vol. 73:6; ISSN 0043-2296; ISSN WEJUA3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101* -- Metals & Alloys-- Preparation & Fabrication
ALLOYS
AUSTENITIC STEELS
BEAM SHAPING
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
ELECTROMAGNETIC RADIATION
FABRICATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
JOINING
JOINTS
LASER RADIATION
LASER WELDING
MATERIALS
NICKEL ALLOYS
PERFORMANCE
RADIATIONS
STAINLESS STEEL-304
STAINLESS STEELS
STEEL-CR19NI10
STEELS
WELDED JOINTS
WELDING
WELDING MACHINES