Because of the high-impact loads which these tools are subjected to, over and over again, their serviceable life is quite limited. Work hardening occurs at the neck of the tool, fractures develop and the toolhead soon breaks off. Although they are relatively inexpensive, because they are so simple in design and construction, their failure can mean an improperly set fastener, downtime, etc.

Other serious problems in the use of bucking bars is the strain and fatigue which the persons using such tools experience and the noise level incident to their use. The tool must be held tight against the work, from behind, and with one hand, while the impacting fastener is applied with a work tool held in the other hand. The shock load is transmitted through to the bucking bar and is taken fully by the operator and a high-decibel shock wave is produc

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A bucking bar, comprising: toolhead and handle parts secured together and having a low recoil impact absorbing and compressible spacer provided there between, said toolhead and handle parts being formed for interfitting engagement and butt end shouldered engagement of the former against the latter, and fastener means extending transversely across and between said toolhead and handle parts for holding said toolhead and handle parts engaged with said spacer and for allowing relative movement therebetween in the impact absorbing compression of said spacer, said toolhead and handle parts having interfitting planular wall surfaces extending longitudinally and said fastener means provided therethrough.

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Rivets and like fasteners require a backing member behind the work receiving the fastener to spread the blind end of the fastener and to stabilize the two parts while they are being fastened together. Tools of this type are commonly known as bucking bars and are usually no more than a bar of iron or steel with one end formed at a right angle.

Although there have been some suggestions for improvements in this type of tool, and notably in impact absorbing cushioning means, none have proven very successful.

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Zirconium tungsten electrodes new material object of the invention is to provide a zirconium tungsten electrode new materials, in addition to ensure the use of performance indicators have reached the international zirconium tungsten electrode material , but also improve the zirconium tungsten electrodes new material ductility and stress processing performance, increase yield and expand its use .

Tungsten electrodes new material zirconium basic design of the invention to change the electrode material zirconium tungsten , tungsten oxide, zirconium content ratio , while the component is added to improve processing performance pressure , improve the ductility of yttrium oxide , cobalt ingredients, the object of the present invention .

Specific embodiments of the present invention is described below. Zirconium tungsten electrodes new material made ​​of tungsten , zirconia, yttria , four major components, which are cobalt , contains a very small amount of aluminum , iron, silicon , nickel, magnesium, copper , molybdenum and carbon impurities. The four main elements of the new tungsten electrode material content of zirconium contained in the ratios were : tungsten content 98 ~ 98.8% , content of zirconium oxide, 0.91 to 1.2% yttria content of 0.01 to 0.07% cobalt 0.01 to 0.02%. According to the above formula, according to conventional processes existing zirconium tungsten electrodes made ​​of new materials to replace thorium tungsten, cerium and zirconium tungsten electrode material , superior processing performance of the pressure existing foreign zirconium tungsten electrode material .


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