Tungsten alloy swaging rod is made of tungsten alloy rod through calcinations. The normal method used in the processing are extruding, forging and sintering. After calcinations, tungsten alloy swaging rod has higher ductility, toughness and tensile strength than tungsten alloy rod, so it can be used for a longer time. CBU-87 used tungsten alloy swaging rod to destroy armor vehicle.

The CBU-87 is a cluster bomb used by the United States Air Force, developed by Aerojet General/Honeywell and introduced in 1986 to replace the earlier cluster bombs used in the Vietnam War. CBU stands for Cluster Bomb Unit. When the CBU-87 is used in conjunction with the Wind Corrected Munitions Dispenser (WCMD) guidance tail kit, it becomes a precision-guided weapon, designated CBU-103.

With the high density and hardness of tungsten alloy swaging rod, CBU-87 can penetrate armor easily.



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Tungsten alloy swaging rod is made of tungsten alloy rod through calcinations. The normal method used in the processing are extruding, forging and sintering. After calcinations, tungsten alloy swaging rod has higher ductility, toughness and tensile strength than tungsten alloy rod, so it can be used for a longer time. GBU-15 used tungsten alloy swaging rod as raw materials of its warhead.

GBU-15 is an unpowered, glide weapon used to destroy high-value enemy targets. It was designed for use with F-15E Strike Eagle, F-111 'Aardvark' and F-4 Phantom II aircraft, but the United States Air Force is currently only deploying it from the F-15E. The GBU-15 has long-range maritime anti-ship capability with the B-52 Stratofortress. Rockwell International is the prime contractor for this weapon system.

GBU-15 takes advantage of density and hardness of tungsten alloy swaging rod to destroy high-value enemy targets.



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Tungsten alloy swaging rod is made of tungsten alloy rod through calcinations. The normal method used in the processing are extruding, forging and sintering. After calcinations, tungsten alloy swaging rod has higher ductility, toughness and tensile strength than tungsten alloy rod, so it can be used for a longer time. GBU-53/B is planning to use tungsten alloy swaging rod as raw materials of its warhead.

The GBU-53/B is an American air-launched, guided bomb. Development was started in 2006 for a 250 pounds (113 kg) class bomb that can identify and strike mobile targets from standoff distances in all weather conditions. It will be integrated on the F-15E and F-35 Joint Strike Fighter. Its first flight was announced on May 1, 2009.

GBU-53/B takes advantage of density and hardness of tungsten alloy swaging rod to destroy underground bunker.



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Tungsten alloy swaging rod is made of tungsten alloy rod through calcinations. The normal method used in the processing are extruding, forging and sintering. After calcinations, tungsten alloy swaging rod has higher ductility, toughness and tensile strength than tungsten alloy rod, so it can be used for a longer time. Tungsten alloy swaging rod has been widely used for GBU-44/B.

The GBU-44/B is a GPS-aided laser-guided variant of the Northrop Grumman Brilliant Anti-Tank (BAT) munition which originally had a combination acoustic and IR seeker. The system was initially intended for use from UAVs, and it is also planned to integrate the weapon with the Lockheed AC-130 gunship, giving that aircraft a precision stand-off capability. The Viper Strike is now produced by MBDA.

With the high density and hardness of tungsten alloy swaging rod, GBU-44/B can penetrate armor and destry armor vehicle.


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Tungsten alloy swaging rod is made of tungsten alloy rod through calcinations. The normal method used in the processing are extruding, forging and sintering. After calcinations, tungsten alloy swaging rod has higher ductility, toughness and tensile strength than tungsten alloy rod, so it can be used for a longer time. Tungsten alloy swaging rod has been widely used for GBU-28.

GBU-28 is a 5,000-pound (2,268 kg) laser-guided "bunker busting" bomb nicknamed "Deep Throat" produced originally by the Watervliet Arsenal, Watervliet, New York. It was designed, manufactured, and deployed in less than three weeks due to an urgent need during Operation Desert Storm to penetrate hardened Iraqi command centers located deep underground. Only two of the weapons were dropped in Desert Storm, both by F-111Fs.

Tungsten alloy swaging rod has high density and high hardness which can help GBU-28 penetrate the rock formation and destroy underground bunker.



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Tungsten alloy swaging rod is made of tungsten alloy rod through calcinations. The normal method used in the processing are extruding, forging and sintering. After calcinations, tungsten alloy swaging rod has higher ductility, toughness and tensile strength than tungsten alloy rod, so it can be used for a longer time. Tungsten alloy swaging rod has been widely used for GBU-57.

GBU-57 is a U.S. Air Force, precision-guided, 30,000-pound (13,608 kg) "bunker buster" bomb.[2] This is substantially larger than the deepest penetrating bunker busters previously available, the 5,000-pound (2,268 kg) GBU-28 and GBU-37.

Tungsten alloy swaging rod has high density and high hardness which can help GBU-57 penetrate the rock formation and destroy underground bunker.



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The  bucking bars made of tungsten resulted in significantly less vibration measured at the bucking bar when compared to the other two bucking bar materials (cold rolled and stainless steel). The >90% tungsten bar resulted in a 34% decrease in the resultant weighted acceleration when compared to using the cold rolled bar, and a 37.5% decrease when compared to using the stainless steel bar. Additionally, the >90% tungsten bar resulted in 2.8% less vibration transmission than the 90% tungsten bar, although this difference was not statistically significant. The magnitude of the weighted resultant acceleration indicates how fast the bucking bar is “bouncing” or moving as the energy is transferred from the rivet gun through the rivet to the bucking bar. Thus, a bucking bar that is accelerating less would be expected to result in lower grip force to control the bucking bar. Thus, when using bucking bars of the same size, the heavier tungsten bars were superior to the traditional steel bucking bars in terms of dampening vibration transmission without the added cost of increased muscle force to control the bars during riveting. This may also result in a positive health effect as the tungsten bucking bars resulted in an increase in the estimated duration for 10% of the exposed population at the measured acceleration levels to show symptoms of finger blanching (ISO 5349) of at least 49% and 64% when compared to the cold rolled and stainless steel bars, respectively.

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Recently, bucking bars made of tungsten have been utilized for some riveting tasks at a local
aircraft manufacturer, where subjective reports from the employees suggested less vibration was
transmitted to the hands. However, since the tungsten bars weigh approximately 2.3 times more
than the steel bucking bars of the same size and shape, the company was reluctant to implement
tungsten bucking bars on a full scale. While the increased mass of the tungsten bar may be an
advantage as far as dampening the vibration, the effect on the hand grip exertion levels was
unknown. Therefore, the overall objective of this study was to perform a field evaluation to quantify
and compare the vibration transmission and grip muscle activity characteristics when using bucking bars of the same size and shape, but made of different materials.

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Although the use of composite materials is increasing in the manufacturing of aircraft, manual
riveting operations are still very pervasive in the assembly of aircraft. Riveting operations in aircraft manufacturing involves the use of power tools for manually drilling and countersinking holes for the rivets, as well as the use of air hammers or rivet guns to drive and set the rivets. Additionally, to close the rivet, the rivet is driven against a metallic bar commonly called a “bucking bar”. The bucking bars are typically held manually, and must be held firmly to increase the quality of the riveting, as well as keep the bucking bar from “dancing” against the metal piece being riveted.

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Riveting tasks in aircraft manufacturing results in exposure to vibration from both rivet  guns and bucking bars. Long term exposure to vibration has been associated with symptoms of vibration white finger and musculoskeletal disorders. Four different bucking bars of the same shape but different material and mass characteristics (90%tungsten, >90% tungsten, cold rolled and stainless steel) were investigated for vibration and grip muscle activity during a riveting task. The >90% and 90% tungsten bars (3.4m/s and 3.6 m/s2, respectively) resulted in significantly less mean resultant weighted acceleration when compared to the cold rolled and stainless steel (5.3 m/s2 and 5.6m/s2, respectively),  whereas there was no difference in mean hand grip flexor or extensor muscle activity. These results suggest that for bucking tasks that allow access for the bucking bar size investigated, use of heavier but same sized tungsten bucking bars can reduce vibration transmission to the hand.

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