Residual stress improvement process by vibration during welding

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:175456

Nishimura, T; Aoki, S ^[1]

---

1. Tokyo Metropolitan College of Technology, Shinagawa-Ku, Tokyo (Japan)

The strong effect of residual stresses on fatigue or stress-corrosion cracking is a well-recognized phenomenon. There are a number of important technological processes which produce or reduce residual stresses. The residual stress created in a structure by a welding operation may influence the mechanical behavior of the structure in several ways. In particular, a reduction in the residual stress caused by welding is very important. A new welding residual stress improvement process is proposed in this paper. The new method is carried out using vibrational loading which is applied during the welding operation. The advantage of this method is that the vibrational load is generated by a small shaker. Hence, this method is expected to be a practical one. A simple experiment was carried out for a single pass V-shaped groove welded steel plate. The residual stress distributions on several conditions of the excitation frequencies were measured using X-ray diffraction techniques. The experimental results show that tensile residual stress in the bead can be reduced by this method. The mechanism of stress redistribution in a welded joint during vibrational loading is described qualitatively. An elasto-plastic model has been presented to describe the behavior of welded joints under the action of a vibrational force and cooling temperature. Since this process uses a small shaker, it is believed that the benefit of this method can be obtained through minimum additional cost.

• OSTI ID: 175456
• Report Number(s): CONF-950686--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
FATIGUE
RESIDUAL STRESSES
STRESS CORROSION
TEMPERATURE DEPENDENCE
WELDED JOINTS
WELDING
X-RAY DIFFRACTION