YAMATO GOKIN
Welding Consumable Parts
Material
Description
Description
At Yamato Gokin, our products are manufactured to the highest quality and standard through our integrated development and production process.
We produce and offer over 100 types of copper alloys in various shapes and sizes to suit our customers’ unique needs. You can find our products in a wide variety of major industries and markets as we supply our alloy products not only within Japan, but all over the world.
We ensure that our aluminum bronze, copper beryllium, copper chromium, high-strength brass, and specially-developed Corson system alloys meet strict technical standards for safety and quality.
High Temperature Endurance
High Quality
Product Specifications
| Alloy | Mechanical properties | Electrical conductivity | Temperature limit on heat | Equivalent standard | |||
| Tensile strength | Elongation | Hardness | |||||
| N/m2 | % | HRB | L.A.C.S.% at20℃ | ℃ | |||
| EK-2 | Drown bar | 450‐550 | 15-30 | 78-87 | 78-88 | 480-520 | JIS Z 3234-2 ISO5182-1978-2-1 RWMA Class 2 |
| Forged Products | 390-490 | 15-30 | 72-82 | ||||
| Characteristics & Applications | With durability improved byadding special element to copperchromium-zirconium alloy, itexcells in electric conductivity and heat resistanze;hence,it is in usemost windely as resistance welding electrode material. | ||||||
| EK-3 | Drown bar | 510‐640 | 15-30 | 85-92 | 50-70 | 490-530 | RWMA Class B10 |
| Forged Products | 470-590 | 15-30 | 82-90 | ||||
| Characteristics & Applications | Having excelelent mechanical strength of copper-chromium-titanium alloy, EK-3 issuited to the electrode materials working under raised welding pressure where very high strength and durability are required. | ||||||
| EK-4 | Drown bar | 690‐880 | 2020-10-01 00:00:00 | 95-102 | 15-30 | 490-530 | RWMA Class B12 |
| Characteristics & Applications | Having high mechanical strength as well as excellentwear resistance of copper-titanium alloy,EK-4 is quite suitable for the use of electric conductors where high tensile strength and durability are required, EK-4 will be used as a substite for the high-priced beryllium-copper 25 alloy because it can compare with the latter quality | ||||||
| CZ-5 | Drown bar | 490‐600 | 15-25 | 80-90 | 70-85 | 500-550 | JIS Z 3234-2 ISO5182-1978A-2-2 RWMA Class 2 |
| Forged Products | 440-590 | 15-25 | 75-88 | ||||
| Characteristics & Applications | Having a high copper-chromium-zirconium content, it’s high-temperature strength is best suited for seam welding electorode in particular, the surface treated steel plates resistant welding is being used. | ||||||
| SCZ-7 | Drown bar | 500‐650 | 15-20 | 82-92 | 70-80 | 500-550 | JIS Z 3234-2 ISO5182-1978A-2-2 RWMA Class 2 |
| Forged Products | 460-600 | 15-20 | 80-90 | ||||
| Characteristics & Applications | Having a high copper-chromium-zirconium alloy, it excels in high-temperature dtrength and wear resistance and ishigher in quality than CZ-5, Excels in resistance as high-intensity seam welding is being used. | ||||||
| EKB-50 | Drown bar | 730‐880 | 2025-09-01 00:00:00 | 93-105 | 45-60 | 480-520 | JIS Z 3234-3 ISO5182-1978A-3-1 RWMA Class 3 |
| Forged Products | 690-830 | 2025-09-01 00:00:00 | 93-105 | ||||
| Characteristics & Applications | Having the most excellent strength, wear resistance and themal themal durabillity of the beryllium-copper 50 alloy made by adding some sopecial elements to copper beryllium base alloy, EKB-50 proves its merits in the applicatins to flush butt and seam welding electorodes or holders of spot welder operating under very severe working enviroment. | ||||||
| EKB-55 | Drown bar | 750‐900 | 2020-05-01 00:00:00 | 98-105 | 48-60 | 480-520 | JIS Z 3234-3 ISO5182-1978-3-1 RWMA Class 3 |
| Forged Products | 720-840 | 2020-05-01 00:00:00 | 95-105 | ||||
| Characteristics & Applications | Having special elements added to the beryllium-copper alloy with a fitting heat treatment,it contains high strengh, themal conductivity and durability that excel in the high temperature range. It is higher in quality than EKB-50 and is best for used as electrode material for determined extreme conditions. | ||||||
| EKB-25 | Drown bar | 1100-1500 | 2021-08-02 00:00:00 | HRC 36-45 | 20-30 | 315-350 | JIS H 3270 C1720 JIS Z 3234-4 |
| Forged Products | 970 (Min) | 2(Min) | HRC 33 (Min) | ||||
| Characteristics & Applications | EKB-25 metal becomes to compare with special steels in high strength by means of the pertinently suitable heat treament and it has, besides, the outstanding properties relating to those of specific spring character, electric conductivity resistance and wear resistance. | ||||||
| EK-NS50 | Drown bar | 650‐850 | 15-25 | 90-105 | 40-50 | 500-550 | |
| Forged Products | 600-800 | 15-25 | 90-105 | ||||
| Characteristics & Applications | With it’s copper-nickel-silicon-chronium alloy, and eco-friendly (conaini beryllium) attributes, it is best used as electrode material for extreme conditions. | ||||||