ベンカン機工 List of Products and Services

The photo shows the PT test (penetrant testing) being conducted on welded pipe fittings. Penetrant testing is a type of non-destructive testing that is performed without causing physical damage to the product or test piece, and it is used to detect defects that are difficult to see visually on the surface of the product. (This testing method only targets the detection of surface-open defects.) *The coloration in the photo below (detailed information section) is a sample.

■Content■ This is a method of bending thick-walled steel pipes that cannot be manufactured using the mandrel method. It involves clamping with a mold and repeatedly shaping and correcting the material. You can view the hot die bending (CD) process through a video using actual images. 【Process】 Mold → Material set → Press start → Shaping press → Material extraction → Finishing press → Press end → Surface treatment → Product Please visit the "Benkan Kiko Official Website" to see more.

The term "Monaka method" is named as such because it involves stacking two components together like a traditional Japanese sweet called "monaka." You can watch a video of the Monaka method. Please click the link below the contact button that says "Link to the homepage with a video explaining the Monaka method (made of carbon steel)."

■Content■ You can watch a video on the manufacturing method of seamless reducers for piping fittings using the steel pipe outer die method. Please click on the "Related Links" below the contact button.

■Content■ Hydraulic bulging method (hydraulic forming method) - You can watch a video of the forming method for tees. Please click the link below the "Contact Us" button to access the homepage with the video explaining the hydraulic bulging method (hydraulic forming method).

■Content■ You can watch a video of the processing procedure using the mandrel method (hot bending method) for carbon steel.

At Benkan Kiko, we own various testing machines for mechanical tests, including tensile testing machines, bending testing machines, impact testing machines, and hardness testing machines. Our manufacturing plants, Kiryu Plant and Osaka Plant, are equipped to conduct mechanical tests, allowing us to perform product manufacturing and associated mechanical tests within the same facility, thereby achieving high-quality product management and reducing lead times. Additionally, we conduct strict calibration of measuring instruments and manage calibration documents under traceability linked to national standards, so you can trust us with your needs. Mechanical tests can also be conducted in the presence of customers. Please feel free to contact us for more details. We take great pride in our "monozukuri" (manufacturing) and have received high praise for providing high-quality products to our customers. Eastern Japan Sales Division: 03-3777-1521 Western Japan Sales Division: 06-6482-1851

"Bevel" (kaisaki), also known as "groove," refers to the gap created between two base materials when they are joined together. This gap is essential to ensure that the welded joint has the same quality and strength as the base materials. Additionally, a design that minimizes the likelihood of welding defects and high processing precision is required. For example, increasing the bevel angle results in a larger amount of welding material, which can lead to increased welding labor and affect the mechanical properties and shape distortion near the weld due to heat input to the base materials. Conversely, narrowing the bevel angle can lead to decreased workability, poor penetration, and the risk of defects such as slag inclusions that cannot be detected from the surface, increasing the likelihood of welding defects. Therefore, the shape and processing of the bevel are crucial, and they are designed to achieve optimal shapes and dimensions considering factors such as the properties and pressure of the fluid, material, thickness, diameter, and welding environment.

Our company utilizes a 30-ton large batch furnace (4000W x 2700H x 11000L) as the main equipment for heat treatment, and we carry out various heat treatments according to customer requests, conditions, and product sizes. The types of heat treatment we can perform include "Normalization: Annealing," "SR: Stress Relief Annealing," "Quenching: Hardening," "Tempering: Tempering," or combinations of these treatments. (Quenching for large products requires consultation.) For more details, we can offer various considerations and proposals based on customer requests and conditions, so please feel free to contact us.

Radiographic testing (RT) is a non-destructive testing method that allows for inspection without damaging the product, making it possible to examine invisible internal defects. RT is primarily conducted to detect defects in the longitudinal welds of joints and can be applied to products with wall thicknesses ranging from a few millimeters to over 100 mm. We can also accommodate products for which RT is required by regulations such as the Electric Utility Industry Law, the Gas Utility Industry Law, and the High-Pressure Gas Safety Law, as well as those requested by customers. Additionally, considering the test specimen and the defects to be detected, we implement appropriate testing by selecting and combining various methods, including penetrant testing (PT), magnetic particle testing (MT), and ultrasonic testing (UT), in addition to RT. We are also capable of responding to customer requests regarding various tests, so please feel free to consult with us.

At Benkan Kiko, we manufacture welded pipe fittings from materials such as steel pipes, steel plates, and forgings, using materials like carbon steel, alloy steel, stainless steel, and non-ferrous metals. To ensure the integrity of our products, we conduct non-destructive testing in accordance with standards and regulations, as well as in line with customer requirements. Non-destructive testing is a method that examines the presence, location, size, shape, and distribution of defects without destroying the material or product, and is also referred to as "Nondestructive Examination: abbreviated as NDE." It can be divided into tests for detecting surface defects and tests for detecting internal defects. 【Detection of Internal Defects】 1. Radiographic Testing (RT) 2. Ultrasonic Testing (UT) 【Detection of Surface Defects】 3. Magnetic Particle Testing (MT) 4. Liquid Penetrant Testing (PT)

At Benkan Kiko, we conduct various tests using the testing equipment owned by our Osaka and Kiryu factories. Based on our testing technology, we can undertake mechanical testing of metal and steel materials at Benkan Kiko. **Benefits of conducting tests at Benkan Kiko:** - We handle everything from specimen cutting to specimen processing and testing in one package, not just the testing itself. - We can accommodate tests in accordance with JIS, ASTM standards, as well as regulations such as the Electricity Business Act, Gas Business Act, and High-Pressure Gas Safety Act. - We also support various test witnessing (including customer witnessing and third-party witnessing by classification societies). - We can accommodate overseas standards such as ASTM standards. - We accept requests starting from one type and small lots. We will do our best to cooperate with delivery times, so please feel free to contact us if you are in need of urgent testing assistance.

When various documents related to the environment and chemical substances are needed for metal products such as welded pipe fittings, Benkan Kiko will prepare them. If you need them, please first contact us through the "Contact Us" section below for more details. For documents that you are unsure how to respond to, we will provide the necessary information items, so you can simply respond accordingly. Additionally, changes to target components, maximum allowable values, and reporting forms may occur, so we will carefully examine your requests and the issuance rules to provide appropriate documents.

The various special fittings for processes handled by Benkan Kiko require more diverse specifications than commonly used and sold pipe fittings. In particular, pressure resistance performance is a crucial characteristic for ensuring the behavior and safety of pipe fittings under high pressure. Pressure resistance is secured by optimizing the shape and dimensions of the pipe fittings, and one of the design methods used is FEM analysis. This service includes the following main contents: - Design support for piping materials such as pipe fittings using FEM analysis ▻ Design of special-shaped pipe fittings (replacement from cast piping materials in high-pressure environments, etc.) ▻ Evaluation of pressure resistance performance of existing pipe fittings ▻ Manufacturing of special fittings (support from material procurement to manufacturing, testing, inspection, and shipping) - Various responses are possible by combining with our proprietary technology. For inquiries, please first contact our sales representative or use the web inquiry form on our website. From the initial meeting, a dedicated representative from our technical headquarters will respond, allowing you to directly reflect your requests in the analysis results. We can accommodate various meeting formats, including on-site visits, visits to our company, and web conferences (Zoom, MS Teams, etc.). Please feel free to consult with us.

Among the various tests associated with pipe fittings, there is a "mechanical test" that examines the mechanical properties of the product. One of these tests, the "hardness test," measures hardness by pressing a hard indenter (such as diamond) into the surface of a test piece or product with a constant load using a hardness testing machine. There are several types of "hardness tests," and Benkan Kiko is capable of accommodating each of them. The types of hardness tests include the following: ▻ Brinell hardness test (HBW) ▻ Vickers hardness test (HV) ▻ Rockwell hardness test (HRCW or HRBW, etc.) Benkan Kiko has extensive experience in mechanical testing, and we accept requests not only for tests associated with pipe fittings but also for mechanical tests alone. If you have any concerns, please feel free to consult us. Details of the tests are explained in detail on our company blog.