Fatigue Strength and Fracture Behavior for Overlap Weldment of Gas Metal Arc Welding in Dual Phase Steel

This paper deals with a comprehensive investigation of fatigue life enhancement on semiautomated Gas Metal Arc Welding (GTAW) butt weld joint which is found almost everywhere in Malaysia welding structure steel sectors. The selected material in this study was high strength low alloy steel S460G2+M commonly used extremely in steel structure due to its outstanding mechanical properties. In this investigation, the method for joining the butt weld was conducted by unprofessional welder using semi-automated GMAW. At first, suitable welding parameters were identified and formulated into welding procedure specification (WPS) qualification conforming to AWS D1.1 standard. The test specimens were prepared and tested to ensure the welding quality. Further, the HFMI using Pneumatic Impact Treatment (PIT) technique were applied at the weld toe of the butt weld as tool for fatigue life enhancement. To investigate the influence of HFMI/PIT on the fatigue strength, the specimens were undergone fatigue test using universal fatigue machine using a constant amplitude loading. Finally, the comparison of the fatigue strength of as welded and treated specimens to indicate the beneficial influence of the treatment. Yes, the conduction by unprofessional welder using semi-automatic GMAW, the findings showed the improvement of fatigue strength and slope of S-N curves. In addition, the fracture location of test specimen shows physically affected by shifting from critical weld transition to base metal. The tensile test and hardness value also showed a slight difference as compared to untreated specimens.

Download Full-text

Fatigue strength evaluation and fracture behavior of joined dual phase steel/AA6061-T6 aluminum alloy

Frattura ed Integrità Strutturale ◽

10.3221/igf-esis.48.51 ◽

2019 ◽

Vol 13 (48) ◽

pp. 530-544

Author(s):

Ruben Perez Mora ◽

Celso Eduardo Cruz Gonzalez ◽

Saul Daniel Santillan Gutierrez ◽

Jose Jaime Taha Tijerina ◽

Benjamin Vargas Arista ◽

...

Keyword(s):

Aluminum Alloy ◽

Fatigue Strength ◽

Fracture Behavior ◽

Dual Phase Steel ◽

Dual Phase ◽

Strength Evaluation

Download Full-text

Gas Metal Arc Welding (GMAW) Process Optimization of 1.0 mm Usibor® 1500 P Steel to 1.5 mm Uncoated Dual Phase 780 (DP780) Steel Joint for Automotive Body Structural Applications

10.4271/2010-01-0446 ◽

2010 ◽

Cited By ~ 1

Author(s):

Ramakrishna Koganti ◽

Adrian Elliott

Keyword(s):

Process Optimization ◽

Arc Welding ◽

Gas Metal Arc Welding ◽

Dual Phase ◽

Steel Joint ◽

Automotive Body ◽

Metal Arc Welding ◽

Structural Applications ◽

Dp780 Steel

Download Full-text

Back Bead Characteristics during Butt Welding of a Thick Plate for Various Backing Conditions

Materials Science Forum ◽

10.4028/www.scientific.net/msf.654-656.350 ◽

2010 ◽

Vol 654-656 ◽

pp. 350-353 ◽

Cited By ~ 4

Author(s):

Cheol Hee Kim

Keyword(s):

Fatigue Strength ◽

Arc Welding ◽

Thick Plate ◽

Gas Metal Arc Welding ◽

Butt Joint ◽

Butt Welding ◽

Weld Defects ◽

Metal Arc Welding ◽

Welded Structure ◽

Job Site

In a welded structure, thick plates are joined by multi-pass welding in the butt joint. During the first pass of multi-pass welding, burn-through, lack of fusion, and incomplete penetration were readily found as weld defects. Accordingly, the backing condition should be carefully selected in welding of a thick plate, because improper backing conditions lead to weld defects. In the job site, a steel backing strip is usually adopted, although it reduces the fatigue strength. No backing conditions or removable backing is recommended to increase the fatigue strength, but selection of the proper backing and welding conditions is complicated. In this study, several backing methods, such as ceramic backing, water-cooled copper backing, and even the use of no backing, were investigated during GMA (Gas Metal Arc) welding of a thick steel plate. The gas metal arc welding conditions were established for each backing method, and the bead shape and mechanical properties were examined after welding.

Download Full-text