Details
| Original language | English |
|---|---|
| Pages (from-to) | 405-408 |
| Number of pages | 4 |
| Journal | Procedia CIRP |
| Volume | 111 |
| Early online date | 6 Sept 2022 |
| Publication status | Published - 6 Sept 2022 |
| Event | 12th CIRP Conference on Photonic Technologies, LANE 2022 - Erlangen, Germany Duration: 4 Sept 2022 → 8 Sept 2022 |
Abstract
Laser beam welding is precise, quick and highly automatable. Nevertheless, disadvantageous hardness profiles can result and promote cracking. By an ultrasonic post treatment, crystal defects, internal stress and grain structure can be altered to achieve uniform hardness. In the investigations round bars with 30 mm diameter made from stainless steel grade 1.4301 are welded by laser in a rotational process. Ultrasonic excitation is applied utilizing a longitudinal mode of the system. The weld pool is positioned in the node or the antinode of the amplitude distribution. The excitation amplitude varies at 0/2/4 µm and the treatment durations at 0/5/10 min. The welds are evaluated by metallographic cross sections and hardness measurements. The results indicate the effects of acoustic residual softening and hardening. With standard deviations of about 2 %, the weld hardness is decreased by 3 % with nodal excitation and increased by 4 % with antinodal excitation. The difference between weld and base material hardness is not reduced since the base material is hardened at all ultrasonic parameters used.
Keywords
- acoustic hardening, acoustic residual softening, laser beam welding, round bars, ultrasonic excitation
ASJC Scopus subject areas
- Engineering(all)
- Control and Systems Engineering
- Engineering(all)
- Industrial and Manufacturing Engineering
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In: Procedia CIRP, Vol. 111, 06.09.2022, p. 405-408.
Research output: Contribution to journal › Conference article › Research › peer review
}
TY - JOUR
T1 - Investigations on the effect of post treatment utilizing ultrasonic standing waves on the hardness of laser beam welds in stainless steel
AU - Grajczak, J.
AU - Nowroth, C.
AU - Long, Y.
AU - Twiefel, J.
AU - Wallaschek, J.
AU - Nothdurft, S.
AU - Hermsdorf, J.
AU - Kaierle, S.
N1 - Funding Information: Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – CRC 1153, subproject A3 – 252662854. The authors would like to thank the DFG for the financial and organizational support of this project.
PY - 2022/9/6
Y1 - 2022/9/6
N2 - Laser beam welding is precise, quick and highly automatable. Nevertheless, disadvantageous hardness profiles can result and promote cracking. By an ultrasonic post treatment, crystal defects, internal stress and grain structure can be altered to achieve uniform hardness. In the investigations round bars with 30 mm diameter made from stainless steel grade 1.4301 are welded by laser in a rotational process. Ultrasonic excitation is applied utilizing a longitudinal mode of the system. The weld pool is positioned in the node or the antinode of the amplitude distribution. The excitation amplitude varies at 0/2/4 µm and the treatment durations at 0/5/10 min. The welds are evaluated by metallographic cross sections and hardness measurements. The results indicate the effects of acoustic residual softening and hardening. With standard deviations of about 2 %, the weld hardness is decreased by 3 % with nodal excitation and increased by 4 % with antinodal excitation. The difference between weld and base material hardness is not reduced since the base material is hardened at all ultrasonic parameters used.
AB - Laser beam welding is precise, quick and highly automatable. Nevertheless, disadvantageous hardness profiles can result and promote cracking. By an ultrasonic post treatment, crystal defects, internal stress and grain structure can be altered to achieve uniform hardness. In the investigations round bars with 30 mm diameter made from stainless steel grade 1.4301 are welded by laser in a rotational process. Ultrasonic excitation is applied utilizing a longitudinal mode of the system. The weld pool is positioned in the node or the antinode of the amplitude distribution. The excitation amplitude varies at 0/2/4 µm and the treatment durations at 0/5/10 min. The welds are evaluated by metallographic cross sections and hardness measurements. The results indicate the effects of acoustic residual softening and hardening. With standard deviations of about 2 %, the weld hardness is decreased by 3 % with nodal excitation and increased by 4 % with antinodal excitation. The difference between weld and base material hardness is not reduced since the base material is hardened at all ultrasonic parameters used.
KW - acoustic hardening
KW - acoustic residual softening
KW - laser beam welding
KW - round bars
KW - ultrasonic excitation
UR - http://www.scopus.com/inward/record.url?scp=85141899707&partnerID=8YFLogxK
U2 - 10.1016/j.procir.2022.08.176
DO - 10.1016/j.procir.2022.08.176
M3 - Conference article
AN - SCOPUS:85141899707
VL - 111
SP - 405
EP - 408
JO - Procedia CIRP
JF - Procedia CIRP
SN - 2212-8271
T2 - 12th CIRP Conference on Photonic Technologies, LANE 2022
Y2 - 4 September 2022 through 8 September 2022
ER -