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Cadi Company Inc. Announces New and Updated Information with Regard to the Difference Between the Class 2 Electrode Materials C18200 and C18150

eTradeWire News/10642026
Copper Review: Difference Between the Class 2 Electrode Materials C18200 and C18150

NAUGATUCK, Conn. - eTradeWire -- CADI Company, Inc., a trusted and reliable source for the best in copper alloys and refractory metals as well as electrodes and other similar products and components announces new and updated information with regard to the difference between the class 2 electrode materials C18200 and C18150. The company points out that with these two different electrode materials, the properties are essentially the same. That said, both alloys meet standards for class 2 electrode material as specified by AWS J1.3/J1.3M:2020. Recent informational dissemination by the company explains that C18150 contains an additional amount of zirconium, although at a low level. This particular product is specified for welding galvanized metal. In addition, C18150, meets the requirements of C18200, more specifically when chromium content is controlled and is able to substitute for C18200.

Company officials note that copper alloys with approximately 1% chromium is considered the standard with regard to spot welding electrode material. This has been a standard dating all the way back to the earlier part of the 20th century and has been used since the 1930s, especially about the manufacturing of automobiles. Equally important to note is that chromium when added to copper results in improved hardening by heat treating. Company officials also note that most copper alloys are typically hardened by work hardening only. A very minimal amount of Chromium, indeed less than 0.4 Wt.% is introduced into the copper crystalline microstructure as extremely fine nano-sized particles. This results in the retarding and limiting of slippage in the microstructure. In essence increasing the overall strength and hardness for the copper. This is sometimes referred to as precipitation hardening.

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Also worth noting is that chromium precipitate in copper serves to increase the softening temperature through the process of limiting and decreasing the self-diffusion of copper at elevated temperatures that would normally result in softening via recrystallization. This is typically called softening resistance. During the time period of the 1980's, galvanized steel (zinc coating) became a new standard in the auto industry. It provides for greater corrosion resistance in the manufacturing of automobiles. With the increased application of zinc coated steel, many auto assembly plants experienced spot welding related issues.  These were associated with reduced electrode life and electrodes sticking to the work. The industry quickly discovered that CuCr electrode material from Europe performed better as compared to C18200 produced in the US. The only notable difference was the introduction of a very small amount of zirconium (Zr).

C18150 - What Zirconium does when added to C18200

The zinc of galvanized coating will in effect coat the copper electrodes and alloys with copper. This forms a copper-zinc alloy or brass at the electrode face. The face is now softer and results in accelerated mushrooming in addition to wear of the face of the electrode.  The addition of zirconium (Zr) to C18200 extends electrode life when welding galvanized steel by interfering with the alloying of zinc with the copper electrode face. Zirconium is known to improve creep strength of C18200 at higher temperatures.  C18150 is specified for use in many higher temperature applications beyond the typical resistance welding markets. This. is due to the elevated temperature properties attributed to the addition of Zr.

The company offers the following summary.

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C18200 and C18150 have identical room temperature properties. That is to say hardness, electrical conductivity, tensile strength, and elongation. They are both considered suitable as RWMA Class 2 electrode materials as outlined by AWS J1.3/J1.3M:2020

1.      C18150 - specified for welding of coated materials (improving electrode life)

2.      C18150 - specified for nuclear and particle physics application type components (ITER, tokamak, synchrotron light energy reactors)

3.      C18150 – specified for aerospace applications (rocket engine components)

4.      C18150 / C18200 - specified for use in generation of electric power as well as for rotor bars, end rings, and motor commutators

5.      C18150 / C18200 may be specified for electric connectors and contact applications

6.      C18150 and C18200 - specified as heat flux materials with several applications including casting molds for a variety of metals

This recent announcement by Cadi Company with regard to new and updated information in reference to the difference between the class 2 electrode materials C18200 and C18150 is just one more key indicator that Cadi continues to stay on the cutting-edge of the latest and most state-of-the-art technology and processes as it relates to the copper alloy industry.

About Cadi Company Inc.

Cadi Company Inc. is a company that offers the latest in the manufacturing and the distribution of copper alloys. Cadi is a family owned and operated business with over four decades of experience in the industry. The company deals in copper metal alloys and resistance welding products ranging from electrodes as well as cylinder mounted components and a wide array of other associated products and services. Boasting safety, quality and experience as the core values of the company, Cadi is considered an expert in the field and continues to impress both existing and new customers year after year. Located in Naugatuck CT, the operation is committed to delivering the highest quality products and services in the industry and is recognized nationally and worldwide.

Darlene Capozzi

Source: WYSIWYG Marketing Ryan Jennings
Filed Under: Industrial

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