DWTT TEST PDF

This website uses cookies to improve user experience. By using our website you consent to all cookies in accordance with our Cookie Policy. Used to determine the fracture characteristics of pipelines and pressure vessels, drop weight tear testing DWTT is a critical part of material qualification programs for oil and gas and industrial applications. Our experts help ensure that your materials are fit for purpose in high risk, high pressure situations.

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Steel pipelines are widely used to transport energy in the form of liquid petroleum and natural gas. The steel used in the manufacture of these pipelines must have high strength and toughness, and high resistance to fracture. Over the last few decades, it has been recognized that the Drop-Weight Tear Test DWTT better represents the ductile fracture resistance than the Charpy Test, as it utilizes a specimen that has the full thickness of the pipe and has a fracture path long enough to reach steady-state fracture resistance.

The zones of ductile and brittle fracture during DWTT characterize the quality of pipeline steels. Drop Weight Tear Testing is a material characterization test aimed at avoiding brittle fracture and ensuring crack arrest in pipelines seamless or welded. Qualitest Quali-DWTT series is mainly used for drop weight tear test DWTT of Ferrite Steels, to observe specimen fracture surface after impact within the temperature that fracture type is converted from non-ductility to ductility.

This test method is that the hammer striker with weights is raised to a specific height then released. Free drop hammer impacts and tears the specimen. After the impact, proportions of ductile fracture shear and cleavage on the fracture surfaces are measured. This testing machine complies with the relevant requirements of standards for DWTT such as metallic materials Drop-weight tear tests of ferrite steels.

A specimen supported at both ends is impacted with a cold-press-fitted notch, with the point of impact opposite to the notch. In some cases, high impact energies of up to , Joule are necessary to break the specimen. The operator opens the specimen door on the bath, takes the specimen from the cooling bath and places it on the alignment table.

The operator closes the specimen door. The rest of the sequence is automatic. The autoloader picks the specimen up, places it on the anvil, the clamp is applied and the autoloader returns to the default position.

The drop weight is then released and the broken pieces of the specimen conveyed to the right side of drop tower. The rest of the sequence is automatic: the specimen feeding system picks the specimen from cooling bath, places it on the anvil, and then returns to the default position. The servo-controlled hoist motor is installed at the side of the bottom plate, which facilitates the maintenance.

The top plate of drop tower is a complete steel plate of 50 mm thick, on which two pulleys and protective enclosure are installed, and the hoist rope is passing through the two pulleys.

The bottom plate of the drop tower is made of cast iron which has excellent anti-impact performance. The guide columns are firmly mounted between the top plate and bottom plate through a flange interface, and the parallelism degree should be controlled within 0.

Those columns adopt hollow 45 steel tube, and it is hardened and tempered, the outer surface is electroplated. Two guide columns to ensure that the drop weight hit right in the center of specimen, chrome-plated surface ensure the longest life as well as lowest friction. The drop weight is made of 20 steel plate. The total weight increments of drop weight can be free adjusted, with which the user can regulate impact energy by adjusting the lifting height and quantity of the weight increments.

The hammer tip and hammer structure is separated; the hammer tip is a quick wear component, so it is easy to replace the hammer tip when necessary. Shock absorbers decelerate the loads quickly, gently and without any recoil or bounce back. Also, they are ideally suited for a simple and quick installation, e. Shock absorber bodies and inner pressure chambers are fully machined from solid high-tensile alloy steel. This gives a completely closed-end, one-piece pressure chamber with no seals or circlips being necessary.

The shock absorbers are maintenance-free, self-contained hydraulic devices with the most innovative sealing technology and an extremely compact design. The anvil is mounted on the bottom plate, and it employs alloy 5CrW2Si who has sufficient hardness, its hardness can be up to HRC after heat treatment. Easy to access for periodic inspection and maintenance. AC brushless servo motor fitted with brake, driving sling via a precision gearbox. To collect the fractured specimen and flying debris, the anvil is designed with a slope and make specimen slide along the slope and the specimens are collected on the belt at the bottom plate and then they are transported out of the tower by the conveyer belt.

Protective case secures the whole operation area. Qualitest Temperature Soak Bath system can accommodate up to 10 optional 12 pieces specimens of thickness up to 50mm with a minimum 26mm gap between each specimen. External construction is made from Zinc-coated mild steel sheet. External surfaces finished in stoved epoxy paint, while the internal bath and guides are made from grade stainless steel. Electrical and mechanical safety interlocking. Email Us. Test Application. Metal Testing.

Test Property. Impact Testing. EN What is the Drop-Weight Tear Test? Applications Applications. Semi-Automatic System Without Automatic Specimen Feeding System The operator opens the specimen door on the bath, takes the specimen from the cooling bath and places it on the alignment table. Automatic System With Automatic Specimen Feeding System The operator configures the drop height, cooling temperature and soak time on software.

Advantages Cycle time completely within 10 seconds Safe to operators The system is designed for a minimum cycle time of 3 minutes. Cycle times under 3 minutes with very low energy absorption might result in overheating of the shock absorbers, and consequently to damage.

Technical Specification. Four solid posts ensure the high stiffness Two guide columns to ensure that the drop weight hit right in the center of specimen, chrome-plated surface ensure the longest life as well as lowest friction Ladder to access top to facilitate installation and maintenance Enclosed by squared mesh panels secure the whole drop tower from top to bottom Drop weight The drop weight is made of 20 steel plate.

Heavy Duty Industrial Shock Absorber Shock absorbers decelerate the loads quickly, gently and without any recoil or bounce back. Specimen Anvil and Tup The anvil is mounted on the bottom plate, and it employs alloy 5CrW2Si who has sufficient hardness, its hardness can be up to HRC after heat treatment Note: Tup with load cell inside is for data acquisition option instrumented DWTT Winch Easy to access for periodic inspection and maintenance AC brushless servo motor fitted with brake, driving sling via a precision gearbox Debris collecting system To collect the fractured specimen and flying debris, the anvil is designed with a slope and make specimen slide along the slope and the specimens are collected on the belt at the bottom plate and then they are transported out of the tower by the conveyer belt.

Access to specimen area protected by interlocked doors when the machine is running Emergency stop function electrically isolates winch drive and release. All safety systems dual circuit and fail-safe. No unsafe release of the drop weight possible under any of the following conditions: Failure of mains power supply Failure of compressed air supply Failure of control software.

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DWTT Drop Weight Tear Tester

Quality Testing, Inc. QTI can test heavy wall material with an energy capacity up to 60, ft-lbs 80 kJ. There are several specifications such as API 5L3, and ASTM E that govern the specimen dimensions and how the drop weight test is performed depending on the material properties that which you are trying to determine. API 5L3 is a fracture toughness test used to determine the fracture ductility of a specimen. A set of two specimens are tested per heat number. A pressed notch is most commonly used and is the preferred notch.

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What is the drop-weight tear test?

Steel pipelines are widely used to transport energy in the form of liquid petroleum and natural gas. The steel used in the manufacture of these pipelines must have high strength and toughness, and high resistance to fracture. Over the last few decades, it has been recognized that the Drop-Weight Tear Test DWTT better represents the ductile fracture resistance than the Charpy Test, as it utilizes a specimen that has the full thickness of the pipe and has a fracture path long enough to reach steady-state fracture resistance. The zones of ductile and brittle fracture during DWTT characterize the quality of pipeline steels. Drop Weight Tear Testing is a material characterization test aimed at avoiding brittle fracture and ensuring crack arrest in pipelines seamless or welded. Qualitest Quali-DWTT series is mainly used for drop weight tear test DWTT of Ferrite Steels, to observe specimen fracture surface after impact within the temperature that fracture type is converted from non-ductility to ductility. This test method is that the hammer striker with weights is raised to a specific height then released.

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