The present study features analytical and experimental results of optimizing resistance spot welding performed using a pneumatic (electrode) force system (PFS). This optimization was carried out to incorporate the galvanized steel sheet material SECC-AF (JIS G 3313) SPCC-SD 3141) plate coated with zinc thickness about 2.5 microns. coating on metal surface causes its weldability decrease. aims o...

This study investigates the thickness variation behavior of deep drawing conical products under effect different forming parameters such as die wall inclination angle, punch velocity, sheet thickness, and metal type. Two types were used, low carbon (AISI 1008) galvanized steel sheets, 110 mm diameters circular blanks at 0.9 1.2mm formed by tooling set (punch, die, blank holder). The dies angles...

In modern bearing structures of frame widely used thin-wall steel profiles and constructions from glued timber. Each these materials has its own advantages disadvantages in the issues capacity, rigidity, heat engineering other physical characteristics. For further improvement efficiency buildings it is expedient to consider possibility combination positive properties timber metal due their opti...

Impedance response of zinc and galvanized steel samples exposed in wet-dry cyclic condition using 0.05 M NaCl solution has been analyzed in order to evaluate their corrosion behavior. The wet-dry cyclic test was performed by exposing sample to alternate conditions of 1 h immersion in 0.05 M NaCl solution and 7 h drying at 298 K with relative humidity (RH) of 60% for 10 days consisting of 30 cyc...

Two different cases regarding the zinc coating at the lap joint faying surface are selected for studying the influence of zinc vapor on the keyhole dynamics of the weld pool and the final welding quality. One case has the zinc coating fully removed at the faying surface; while the other case retains the zinc coating on the faying surface. It is found that removal of the zinc coating at the fayi...

Rhizosphere investigations are restricted by the sheer number of cultures that must be handled in the multitude of different tubed media needed to characterize each isolate. A current rhizosphere study called for the use of 25 different diagnostic media with each of hundreds of isolates, a burdensome and laborious problem. Moreover, the replica plating technique of J. Lederberg and E. M. Lederb...