scholarly journals Fatigue Strength Improvement Methods by Treating the Weld Toe.

1999 ◽  
Vol 17 (1) ◽  
pp. 111-119 ◽  
Author(s):  
Chitoshi MIKI ◽  
Kengo ANAMI ◽  
Hideki TANI ◽  
Ichiro SUGIMOTO
Keyword(s):  
Fatigue Strength ◽  
Fatigue Strength Improvement ◽  
Weld Toe ◽  
Strength Improvement

scholarly journals Weld toe modification using spherical-tip WC tool FSP in fatigue strength improvement of high-strength low-alloy steel joints

2018 ◽  
Vol 160 ◽  
pp. 1019-1028 ◽  
Author(s):  
Hajime Yamamoto ◽  
Yoshikazu Danno ◽  
Kazuhiro Ito ◽  
Yoshiki Mikami ◽  
Hidetoshi Fujii
Keyword(s):  
Fatigue Strength ◽  
Alloy Steel ◽  
High Strength ◽  
Low Alloy Steel ◽  
Fatigue Strength Improvement ◽  
Weld Toe ◽  
Steel Joints ◽  
Strength Improvement

Residual Stress Reduction and Fatigue Strength Improvement by Controlling Welding Pass Sequences

1999 ◽  
Vol 122 (1) ◽  
pp. 108-112 ◽  
Author(s):  
Masahito Mochizuki ◽  
Toshio Hattori ◽  
Kimiaki Nakakado
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Stress Reduction ◽  
Stress Amplitude ◽  
High Stress ◽  
Initial Residual Stress ◽  
Fatigue Strength Improvement ◽  
Weld Toe ◽  
Goodman Diagram ◽  
Strength Improvement

The effects of residual stress on fatigue strength at a weld toe in a multi-pass fillet weld joint were evaluated. The residual stresses in the weld joints were varied by controlling the sequence of welding passes. The residual stress at the weld toe was 80 MPa in the specimen whose last welding pass was on the main plate side, but it was 170 MPa in the specimen whose last pass was on the attachment side. The fatigue strength was nearly the same at high stress amplitude for both specimens, but the fatigue strength of the specimen whose last weld pass on the main plate was higher than that of the other specimen at low stress amplitude. This difference is due to the magnitude of the initial residual stress and the relaxation of the residual stress under fatigue cycling. The effects of the residual stress were shown in a modified Goodman diagram, in which residual stress is treated as a mean stress. [S0094-4289(00)01701-1]

Evaluation of Fatigue Strength Improvement of Ship Structural Details by Weld Toe Grinding

2006 ◽  
Vol 324-325 ◽  
pp. 1079-1082 ◽  
Author(s):  
Myung Hyun Kim ◽  
Sung Won Kang ◽  
Jae Myung Lee ◽  
Wha Soo Kim
Keyword(s):  
Fatigue Strength ◽  
Surface Defects ◽  
Quantitative Measure ◽  
Fatigue Tests ◽  
Weld Bead ◽  
Fatigue Strength Improvement ◽  
Structural Details ◽  
Weld Toe ◽  
Loading Modes ◽  
Strength Improvement

In order to strengthen or repair the welded structural members or fatigue damaged areas, various surface treatment methods such as grinding, shot peening and/or hammer peening are commonly employed among other methods available. While the weld toe grinding method is known to give 3~4 times of fatigue strength improvement, this improvement may significantly vary according to weld bead shapes and loading modes. In this context, a series of fatigue tests is carried out for three types of test specimens that are typically found in ship structures. Weld burr grinding is carried out using an electric grinder in order to remove surface defects and improve weld bead profiles. The test results are compared with the same type of test specimen without applying the fatigue improvement technique in order to obtain a quantitative measure of the fatigue strength improvement. Moreover, structural stress method is employed to evaluate the effectiveness of the method in evaluating the fatigue strength improvement of welded structures.

Methods for fatigue strength improvement by weld toe treatment

1999 ◽  
Vol 13 (10) ◽  
pp. 795-803 ◽  
Author(s):  
C Miki ◽  
K Anami ◽  
H Tani ◽  
I Sugimoto
Keyword(s):  
Fatigue Strength ◽  
Fatigue Strength Improvement ◽  
Weld Toe ◽  
Strength Improvement
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