Neturen Co. | Date: 2015-05-28
A main reinforcing bar has a strength transition portion between a normal strength portion and a high strength portion. The high strength portion is arranged in a joint section. The boundary between the normal strength portion and the strength transition portion is configured as a deigned point. The designed point is designed such that, at the time of an earthquake, the main reinforcing bar yields at the designed point before the main reinforcing bar yields at the root of the beam at of the joint section. The boundary between the high strength portion and the strength transition portion is located in the joint section, and the root of the beam is located at the strength transition portion. The strength of the strength transition portion at the root of the beam is equal to or higher than the required strength.
Japan National Institute of Materials Science and Neturen Co. | Date: 2015-06-12
A welding equipment for metallic materials capable of performing heat treatment such as tempering based on partial heating in spot welding is provided. The welding equipment sandwiches metallic materials with a pair of electrodes, and heats different regions of the metallic materials by energization, with the pair of electrodes maintained at the same position with respect to the metallic materials. The welding equipment includes a first heating means connected to the pair of electrodes for heating and welding the internal region of the circle defined by projecting the cross-sectional area of the axis of the electrodes on the metallic materials by applying power having a low first frequency, a second heating means for heating a ring-shaped region along the circle by applying power having a second frequency that is higher than the first frequency, and an energization control unit for independently controlling the first and the second heating means.
Neturen Co. | Date: 2015-12-23
The core metal for resin welding improves bonding strength between an outer peripheral resin member and the core metal. The outer peripheral resin member
Neturen Co. | Date: 2015-09-09
Object of the present invention is to provide a welding method prevented the fracture at the spot welding zone by recovering the strength of a spot welding zone, namely, the ductility and the toughness in the spot welding zone, and a weld structure manufactured by the method. In the welding method, a spot welding zone provided with a weld nugget
Neturen Co. | Date: 2015-12-10
A rebar structure includes a plurality of column longitudinal bars to be connected to a beam. The yield point or the 0.2% proof stress of at least a portion the column longitudinal bars is larger than the yield point or the 0.2% proof stress of a normal reinforcing bar defined by JIS G 3112.