Effects of Shielding Gas Flow Rate and Power Waveform on Nd:YAG Laser Welding of A5754-O Aluminum Alloy

• Kuo Tsung-Yuan

  Department of Mechanical Engineering, Southern Taiwan University of Technology

• Lin Yen-Tsun

  Department of Mechanical Engineering, Southern Taiwan University of Technology

抄録

Although the microstructure, hot crack susceptibility and porosity of aluminum alloy laser welds are affected by many welding parameters, the effects of the shielding gas flow rate and the power waveform are particularly significant. In this study, a high-power Nd:YAG laser is used to weld A5754-O aluminum alloy sheets of 1 mm in thickness. Initially, bead-on-plate (BOP) welding is performed using a rectangular waveform with a constant mean output power and three different levels of ΔP (ΔP=P_p−P_b, where P_p is the peak power and P_b is the base power). Butt welding is then performed using the appropriate BOP welding speed, which is lower than the welding speed for just full penetration, and one of two levels of ΔF (ΔF=F_f−F_b, where F_f is the face shielding gas flow rate and F_b is the back shielding gas flow rate). The BOP welding results show that reducing the value of ΔP increases the welding speed required for full-penetration, and therefore increases the penetration depth to bead width ratio and the micro-hardness of the weld bead. The butt welding results show that the tensile strength and total elongation properties of the high ΔF (ΔF_H) specimens are approximately three times higher than those of the low ΔF (ΔF_L) specimens. This is primarily due to the absence of hot cracking in the ΔF_H specimens, together with a finer microstructure and a lower level of porosity. This study demonstrates that the effect of ΔF on the weld bead geometry, microstructure, hot crack susceptibility and mechanical properties is far higher than that of ΔP. However, the effect of ΔP on the change of welding speed is higher than that of ΔF.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 47 (5), 1365-1373, 2006

  公益社団法人 日本金属学会

キーワード

• A5754-O
• Nd:YAG(neodymium: yttrium-aluminum-garnet)
• laser welding
• porosity
• shielding gas flow rate
• hot cracking

詳細情報

• CRID: 1390282679227988480
• NII論文ID: 10017490380
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.47.1365
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 7914967
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7914967
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/47/5/47_5_1365/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可