In recent years, increasing automotive safety by improving crashworthiness has been a focal point in the industry, employing high-strength steel such as press hardenable (PHS). addition to improved strength of individual parts body vehicle, resistance-spot-welded joints these is highly important obtain safe structure. general, dimensions weld nuggets are regarded one criteria for quality spot-w...

Steel plates in double skin composite (DSC) panels are restrained by a concrete core and welded stud shear connectors at discrete positions. Local buckling of steel plates in DSC panels may occur in a unilateral mode between stud shear connectors when subjected to combined states of stresses. This paper studies the local and post-local buckling strength of steel plates in DSC panels under biaxi...

To evaluate the fatigue life of Q420C steel welded joints, tests were performed on butt-welded cross-butt-welded joints and cross-fillet-welded joints. The strength S-N curves fitted. Then formation development cracks analyzed by fracture morphology. properties compared with literature data standard curves. results showed that test three types roughly above Moreover, joint was significantly hig...

In this research, St37 and 316L steel sheets were welded using friction stir welding (FSW) process and effective parameters such as the rotational speed, linear speed of the tool, pin diameter, and their appropriate values were studied. The microstructure, hardness, and strength of the different welding regions were investigated. It was observed that in the stir zone (SZ), a mechanical operatio...

In recent years, with the development of high-strength steel materials and improvements in welding technology, has been widely used structure. Nagoya Zokei University Art & Design project, 40m trusses is designed, 100mm thick TMCP440 was for diagonal members. The erection plan required on-site welded joints at ends diagonals, ensuring quality welds a major construction management issue. Therefo...

This paper proposes a novel Lamb wave line sensing technique for crack detection in a welded stiffener. The proposed technique overcomes one of the biggest technical challenges of Lamb wave crack detection for real structure applications: crack-induced Lamb waves are often mixed with multiple reflections from complex waveguides. In particular, crack detection in a welded joint, one of the struc...

usd7 is one of the steel products of isfahan steel company. it is cast in continuous casting moulds and rolled up to a rod of 5 mm diameter. finally, it is wire drawn up to 3 mm and used as welding electrodes. this steel contains 0.05 to 0.09 wt. % carbon. the acceptable limit of the aluminium in this class of steel is less than 0.003 wt%. therefore, it is categorized as rimmed steel. during fo...

Brittle damages have been examined widely since welding became common practice when it comes to carrying out robust structures. Welded structure of the ship hull has be continuous. that occur on structures always thoroughly. Cracks are most commonly initiated at locations where stress concentrators exist. These can originate due flaws during design phase or mistakes assembly structure. When fai...