MKM Enterpriese Aundh, Pune, Maharashtra

Tungsten Copper alloy is an alloy composite of Tungsten and Copper which has the combination s of the excellent properties of Tungsten and Copper, such as heat resistance, aberration resistance, high density, excellent thermal and electrical conductivity. It is easy to be machine. We Supply Tungsten Copper by Press, Sinter & Infiltration method with the tungsten content ranging from 50% to 90% by weight. The balance is copper.   1. Electrical Contact materials Electrical contacts are subjected to extreme mechanical and thermal stresses during operation. For fractions of a second, temperatures rise to several thousand degrees as a result of the arcing. Only Tungsten Copper materials will stand these high temperature & aberration. Tungsten Copper material has good resistance to arc erosion, mechanical wear, contact welding and good conductivity. They are usually selected for oil, gas, air or vacuum, devices. The contact surfaces will oxidize when switched in air. These press-sinter-infiltrate materials should only be considered for arcing surfaces in air when used as arcing tips, arc plates and arc runners. When switching with moderate contact arcing, the Tungsten Copper with a high copper content may give the lowest erosion. As arcing severity increases, the Tungsten Copper with the higher refractory content withstand arc erosion better. Tungsten Coppers are also used as arcing edges of selector switchblades in transformer tap changers. 2. Electrodes for Spark Erosion Tungsten Copper electrodes are best suitable material for electrical discharge machining (EDM) applications. It has excellent wear resistance, good metal removal rate and ability to retain good detail. It is used where speed and wear resistance are most important. 3. Resistance Welding Tungsten Coppers are used for some spot welding application of low conductivity materials, and as die inserts for flash and butt resistance welding applications. 4. Heat Sinks Modern computer processors like the 586 series and higher, generate a heat output per square centimeter similar to that of a household cooker surface. Tungsten-copper heat sinks and the processor fan remove the heat.

We Supply a large variety of Spot / Projection & Butt welding electrodes to meet diverse needs of the welder. We Supply fully machined electrodes in Chromium Copper, Chromium Zirconium Copper, Beryllium Copper, Tungsten Copper, Tungsten & Molybdenum. We also Supply composite spot welding electrodes with refractory tips of Tungsten or Molybdenum Silver brazed on to Chromium Copper shanks.

It is an accepted norm to adopt cap & shank type of spot welding electrode for large requirements of spot welding internationally. This stems from the inherent advantages of caps which are low cost and higher productivity. Spot welder caps are commonly manufactured by cold heading which results in a double edged advantage of lower material consumption for manufacture (translating into lower costs) and higher mechanical properties like higher hardness, higher tensile strength etc due to intense cold working

Seam welding electrodes are generally in the form of wheels and are referred to as seam welding wheels or rolls. We supply Mipalloy seam welding wheels in Cr.Zr.Cu. Materials. However Ni.Si.Cr.Cu. wheels are available on request. For best results and to ensure lower down times seam welder shafts & housings must be made of Cr.Zr.Cu. Seam welder wheels supplied by us are in proof machined & fully machined condition. All seam welding wheels are manufactured out of individually forged blanks

The following list illustrates some of the tungsten applications:Thoriated or Zirconiated or rare earth oxide alloyed rod electrodes for inert gas welding (TIG welding electrodes).Sintered pure tungsten electrical contactsHigh temperature furnace parts such as tungsten heating coils, reflectors and structural material etc.

A Nickel Silicon Chromium Copper is an alloy having a high hardness and improved electrical conductivity almost equal to that of Beryllium Copper. The alloy is composed by weight of 2.0% to 3.0% Nickel, 0.4% to 0.8% Silicon, 0.1% to 0.5% Chromium, and the balance Copper.It replaces the Beryllium Copper in practically all applications. Nickel Silicon Chromium Copper is used wherever a good electrical or thermal conductivity is required together with high mechanical properties Applications include Electrode Holders and Seam Welding Shafts, Spot welding electrodes, Seam Welding Wheels, Projection and Butt welding dies, Plunger tips for cold chamber aluminium die casting machines, Parts of Moulds for Injection moulding of plastics, Injection-Nozzles and Cooling Pins etc.  

CONTACT TIPS FOR MIG WELDING IN CHROMIUM ZIRCONIUM COPPERWe Supply contact tips out of Chromium Zirconium Copper drawn tubes having hardness of 83 'R'B. Because of its high hardness together with higher annealing temperature (525°C). These contact tips will Give very good life Reduce wire sticking Reduce wire wandering Reduce hole enlargement or contraction during service. We invite your enquiries with drawings, samples or part number with make to give you most competitive prices. We urges you to insist on Chromium Zirconium Copper tips because a torch is only as good as its tip.  

Molybdenum is a refractory metal typically used in high temperature applications. Key properties include: Low co-efficient of thermal expansion (5.1x10-6 m/m/°C) which is about half that of most steels Good thermal conductivity Good electrical conductivity Good stiffness, greater then that of steel (Young's Modulus 317MPa) High melting point (2615°C) Good hot strength Good strength and ductility at room temperature High density (10.2 g/cm3) Its ability to withstand high temperatures and maintain strength under these conditions are responsible for the fact that molybdenum finds most of its application at elevated temperatures. In fact, it can work at temperatures above 1100°C (in non-oxidising conditions), which is higher than steels and nickel-based super alloys. When exposed to temperatures in excess of 760°C in air rapid oxidation can result. Under these conditions, the oxide layer sublimes and the base metal is attacked. Thus, molybdenum performs best in inert of vacuum environments.  

Mipalloy seam welder wheels are the benchmark for quality in the industry. We Supply forged & fully heat treated seam welder wheels in Cr.Cu., Cr.Zr.Cu. Wheels are made in varying thickness from 2" diameter to 28" diameter in proof machined condition or fully machined ready to use. Our Seam wheels guarantee higher hardness & electrical conductivity resulting in superior performance. Most common sizes are available at earliest. Seam welding electrodes perform three important functions in all resistance welding operations They conduct the welding current to work. They transmit the proper electrode pressure or force to the work in order to produce satisfactory weld. They dissipate heat from the weld zone. They must withstand stresses at elevated temperatures without excessive deformation. We are dedicated to Supply of superior quality seam welder wheels for the industry.  

Many applications demands Copper to have higher mechanical properties and to be capable of use at elevated operating temperatures while still retaining the good conductivity for which it is selected in the first place. The high-copper alloy family includes Beryllium Coppers, 2% Beryllium Copper, Chromium Coppers, Zirconium Copper , Chromium Zirconium Copper and Nickel Silicon Chromium Copper.

Chromium Zirconium Coppers are used widely in areas where high electrical and thermal conductivity are required combined with good mechanical properties. Uses include Resistance Welding Machine Electrodes, Seam Welding Wheels, Spot Welding Tips, Flash Butt Welding Electrodes, Anvil Contact Bars, Electrical Switch Gear Contacts & Terminals, Electrode Holders, Cable Connectors, Current Carrying Arms and Shafts, Circuit Breaker Parts, Heat Sinks, Short Circuit Rings, MIG welding contact tubes and many other applications where Copper would normally be the ideal choice for High Conductivity but is just not Strong enough. C18150 Chromium Zirconium Copper is used extensively for cap style resistance welding electrodes. Evidence suggests that it can provide less sticking and resist deformation longer than its chromium copper counterpart in some specific situations.

Beryllium Copper alloys are used for their High Strength and Good Electrical and Thermal Conductivities. There are two groups of Beryllium Copper alloys. One is High Strength Alloys and the other High Conductivity Alloys. The High Conductivity Alloys contain 0.2-0.7% Beryllium and higher amounts of Nickel and Cobalt. These alloys are used in applications such as Electronic Connector Contacts, Switch and Relay Blades, Control Bearings, Housings for Magnetic Sensing Devices, Non Sparking applications, Small Springs, High Speed Plastic Molds and Resistance Welding Electrodes. Their high conductivity enables high production speed, while their good corrosion and oxidation resistance promotes long mould life. Beryllium copper is used in Springs & Collets and other parts that must retain their shapes during periods in which they are subjected to repeated strain. Due to its Electrical Conductivity, it is used in Low-Current Contacts for Batteries and Electrical Connectors. And because it is Non-Sparking but physically tough and non-magnetic, it is used to make tools that can be used in explosive environments