Kabushiki Kaisha Kobe Seiko Sho

Akira Matsuguchi

Norio Masaie

Kazuhiko Ito

Hiroyuki Shimizu

Tomoyuki Tachibana

Atsushi Furuya

Yoshikazu Sasa

Kuniaki Miyazaki

Masami Tano

Shinji Komatsu

Disclosed herein is a manufacturing method, excellent in wire drawability, of a seamed flux-cored welding wire having both favorable feedability and low hydrogen content characteristic. The method for manufacturing a seamed flux-cored wire, comprises the steps of: drawing a tube-like formed wire including a flux filled therein using a lubricant; removing the lubricant from the drawn wire by a physical means; and coating a lubricant (coating an oil) for wire feeding on the wire surface. The respective steps are carried out in an in-line manner. In the wire drawing step, a wire drawing lubricant containing a sulfur-bearing high-pressure lubricant is used, and the overall wire drawing from the tube-like formed wire to a roughly product-diameter wire is carried out by means of a roller die.

Method for manufacturing seamed flux-cored welding wire

In a welding wire container, an inner cylinder is inserted inside a bottomed outer cylinder, a pedestal is disposed at a bottom of the inner cylinder, and a bag formed by a resin film is disposed between the outer and inner cylinders. A welding wire is received around an axis of the inner cylinder while being dropped in a coiled state. An upper end portion of the resin film bag is closed to seal the welding wire together with the inner cylinder within the bag. When the container is lifted by grasping holder portions, the weight of the welding wire is borne by means of a belt, whereby the container can be transported easily. Further, the welding wire container has a cap which has been subjected to machining for opening the cap. With this welding wire container, the recovery cost is low or it is possible to eliminate the need of recovery, and the entry of water and moisture from the outside can be prevented, thus permitting a long-term storage of the welding wire. Further, a wire draw-out jig can be attached easily to the container.

Welding wire container

A flux-cored wire for arc welding, wherein a specific surface area, which is defined by the equation of {(Sa/Sm)-1} where Sm is an apparent surface area and Sa is a real surface area in a region to be measured on a surface of the wire, is in the range of from 0.005 to 0.035; and molybdenum disulfide is stuck on the surface of the wire in an amount of from 0.004 to 0.24 g/m.sup.2, and no plating is applied on the surface of the wire. Moreover, a solid wire for arc welding wherein the specific surface area {(Sa/Sm)-1} is in the range of from 0.0005 to 0.05; and molybdenum disulfide is stuck on the surface of the wire in an amount of from 0.001 to 0.5 g/m.sup.2, and no plating is applied on the surface of the wire.

Flux-cored wire and solid wire for ARC welding

A flux-cored wire for arc welding, wherein a specific surface area, which is defined by the equation of {(Sa/Sm)-1} where Sm is an apparent surface area and Sa is a real surface area in a region to be measured on a surface of the wire, is in the range of from 0.005 to -0.035; and molybdenum disulfide is stuck on the surface of the wire in an amount of from 0.004 to 0.24 g/m.sup.2, and no plating is applied on the surface of the wire. Moreover, a solid wire for arc welding wherein the specific surface area {(Sa/Sm)-1} is in the range of from 0.0005 to 0.05; and molybdenum disulfide is stuck on the surface of the wire in an amount of from 0.001 to 0.5 g/m.sup.2, and no plating is applied on the surface of the wire.

Flux-cored wire and solid wire for arc welding

Disclosed is a flux cored wire for low alloy steels and high alloy steels which is excellent in arc stability and moisture absorption resistance of fume/slag. In this flux-cored wire, the flux components and the flux ratio are specified within the following ranges: namely, Na compound (Na.sub.2 O equivalent amount)+K compound (K.sub.2 O equivalent amount) (flux wt %): 1.5-6.0%; soluble Na compound (Na.sub.2 O equivalent amount) (flux wt %): 1.5% or less; soluble K compound (K.sub.2 O equivalent amount) (flux wt %): 0.8% or less; SiO.sub.2 (flux wt %): 5-30%; TiO.sub.2 +ZrO.sub.2 +Al.sub.2 O.sub.3 (flux wt %): 5-40%; flux ratio (wire wt %): 10-30%. Further, the flux components satisfy the formula of {soluble Na compound (Na.sub.2 O equivalent amount)+0.1.times.soluble K compound (K.sub.2 O equivalent amount)}/{SiO.sub.2 +0.5.times.(TiO.sub.2 +ZrO.sub.2 +Al.sub.2 O.sub.3)}: 40.times.10.sup.-3 or less. In addition, one or more kinds of a Li compound (Li.sub.2 O equivalent amount) and a Cs compound (Cs.sub.2 O equivalent amount) may be added in the total amount of 0.1-3.0 wt % so as to satisfy the formula of {soluble Na compound (Na.sub.2 O equivalent amount)+0.1.times.soluble K compound (K.sub.2 O equivalent amount)-Li compound (Li.sub.2 O equivalent amount)-Cs compound (Cs.sub.2 O equivalent amount)}/{SiO.sub.2 +0.5.times.(TiO.sub.2 +ZrO.sub.2 +Al.sub.2 O.sub.3)}=20.times.10.sup.-3 or less.

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Fujisawa, Japan

Akira Matsuguchi