Nntypes of welding electrodes and their uses pdf files

Nonconsumable electrodes are used in tungsten inert gas welding tig and carbon arc welding. The electric arc creates enough heat to melt both the electrode and the base materials. For most heavy industrial jobs or hobbyists a dc power supply can do just about anything. The selection of a correct type of welding electrode for. What are the different types of electrode in welding.

An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit e. They are a long, skinny steel rod with a flux coating. Welding rods, or welding electrodes, remain key components in welding. Electric polarity can affect the usability of welding consumables and the. The 60 welding rod is capable of withstanding 60,000 lbs.

The current forms an arc that jumps a gap from the end of the electrode to the work. The covered electrode is the most popular type of filler metal used in arc welding. The number e6010 indicates an arc welding electrode with minimum stress relieved tensile strength of 60,000 psi. Welding machines and joining machines can be supplied as complete systems, which come with a welding power source, and a. Metal welding electrodes are used for various applications on the indian railway such as in the construction and repairs of. This is a very versatile type of welding rod and is a little easier to use than 6010.

Note that the first 2 digits on welding rods indicate the tensile strength in psi times. Filler metal may or may not be used, and argon inert gas or inert gas mixtures are used for shielding. Perhaps the most convenient and accurate way of determining ph is by using a glass electrode. There are again two sub types of nonconsumable electrodes. Welding electrode classifications mild steel coated electrodes e7018x e indicates that this is an electrode 70 indicates how strong this electrode is when welded. The minimum weld tensile strength produced by this type of electrode is around 70,000 psi, according to metal web news. There are many types of welding rods, and it would be good to know what each of these welding rods has to offer.

For tig welding, the welding rods do not melt, so are called nonconsumable electrodes. Mig welding electrodes wire selection, charts settings and. Welding pressure pipeliners and piping systems lincoln electric. The selection of a correct type of welding electrode for specific application is a very important consideration in metal arc welding.

Welding rod sizes and uses what welding rod do i use. The type of electrode used depends on the specific properties required in the weld deposited. Nonconsumable electrode generally made of tungsten or tungsten alloy and used in tig tungsten arc welding. A skill that takes time to master and and takes quite a lot of practice to perfect for a total beginner. These welding rods are referred to as consumable electrodes. Firstly, there are those with coatings containing cellulose, which uses a layer of gas to protect the weld zone.

Arc welding requires striking a lowvoltage, highcurrent arc between an electrode and the workpiece base metal. Nonconsumable electrodes are made from materials such as pure tungsten, graphite or carbon coated with copper. The composition of the electrode covering determines the usability of the electrode, the composition of the deposited weld metal, and the specification of the electrode. Describe the structure, function, properties, advantages and uses of various types of electrodes. Welding rods are usually coated, although the materials that make up this coating can vary widely. It is considered suitable to use for the steels that are unclean and is useful for making tack welds.

The word was coined by william whewell at the request of the scientist michael faraday from two greek words. The key to this welding method is to hold the stick at the right angle and distance while welding. Different types of welding and what they are used for. Whether a flux is in an electrode coating or is in granular form, as in a submerged arc flux, the requirements are the same.

For this purpose some special types of electrodes are used in brazing, brass welding and aluminium and its alloy welding. Contains less carbon to minimize carbon transfer in the weld. Describe and explain the behaviour of reversible and irreversible metalelectrolyte electrodes and their electrode potentials in terms of ions, electrons and currents. A low carbon, 23% cr, 12% ni rutile coated electrodes for welding corrosion ressistant and heat resistant steels of 309 types. Stick welder power supply with the electrode holder, ground clamp and welding electrodes. Now you know exactly how the different welding processes came. The arc is created between a nonconsumable tungsten electrode and the workpiece. Arc welding or smaw requires use of a covered stick electrode, a metal rod thats coated with a material called flux. Stick welders can be both ac and dc power depending on the electrode type used. A part of castiron can be welded with a mild steel. Stabilizers in the flux make 60 welding electrodes one of the simplest rods to use. Plasma arc welding is very similar in technique to tig welding, but the electrode is recessed and the ionizing gases inside the arc.

The flux must be capable of providing a protective shield to prevent atmospheric. Strip electrodes are used in the overlay welding on. A 18 inch 6010 welding rod works best with an amperage of between 75 and 125 amps. These factors include, but are not limited to, the type of steel, type of weld, loading on the welded joint, applicable codes, level of preheat, level of restraint, position of welding, condition of the steel, and service conditions. Common types and usages details about electrodes are in my ebook. Stick welding learn basic electrode selection, welding. Now we offer the best in their category in 2 pound tubes.

According to metal web news, 6011 electrodes create welds with a minimum tensile strength of around 60,000 pounds per square inch psi. In addition to their use on mild steel, e7016 electrodes are also used for 490. Since its third digit is 1, it means that it can be used for all welding positions. The next series of articles will cover welding electrodes and filler metals, beginning with a brief look at the requirements for a flux. Stick welding is an example of consumable electrode welding, whereby a stick of flux coated consumable electrode is laid onto the weld surface. Ideal verticaldown fillet welding electrode for thinner steel sections using touch welding techniques.

However, it is still widely used for a variety of applications. The electrode that is to be used depends on the type of welding process selected according to which a consumable or a nonconsumable electrode is selected. Oxyfuel equipment is versatile, lending itself to welding, brazing, braze welding, silver soldering, metal. The melting point of carbon is 3350 degree celsius and that of tungsten is 3422 degree celsius. There are three different types of coating applied to shielded arc electrodes, which each have different results during the welding process. Welding rods, or electrodes, are used in the stick welding process and will not be found in mig, fluxcore, tig or any other welding application. Shielded metal arc welding covered arc welding electrodes. Mig wire electrode label meaning for a er70s6 label. The rod must be run on welders that use direct current dc.

Depending upon the process, the electrode is either consumable, in the case of gas metal arc welding or shielded metal arc welding, or nonconsumable, such as in gas tungsten arc welding. The various types of welding machines and joining machines include the complete devices as well as their power sources, monitors, and controllers used for welding, brazing and soldering. Proper use of the filler material and fluxes for the job. Stick welding is a very popular welding method and is used most often in large repair and in the maintenance and construction industries. One example of such an application would be on an engine blade or an air seal. Can be used for welding dissimilar carbon steel to low alloy steel. Plasma arc welding is a precision technique and is commonly used in aerospace applications where metal thickness is 0. Great for the customer that only uses a little of these welding alloys each time and would prefer to buy it as they need it. Suitable electric polarity for smaw electrodes are as follows. Electrode in arc welding an electrode is used to conduct current through a work piece to fuse two pieces together. Different stick welding rods are suited to different amperage settings.

Ceriated tungsten electrodes ceriated electrodes have many of the same advantages of lanthanated electrodes such as good arc starting. Er an electrode or filler rod that is used in either a mig wire feed or tig welding 70 a minimum of 70,000 pounds of tensile strength per square inch of weld ssolid wire 6 the amount of deoxidizing agent and cleansing agent on the electrode. This process is called stick welding because it uses welding sticks or rods that are made up of filler material and flux, the flux is used to. Depending on the pipe size, a half round file can be used to remove any burrs. The welder then fills the container with fresh electrodes. Within both of these groups, there are many different variations and types, which will be covered in more detail later. Chapter 3 introduction to welding in the navy as well as private industry, welding is widely used by metalworkers in the fabrication, maintenance, and repair of parts and structures. Electricity is run through a welding rod, creating an arc of live electricity at its tip and allowing for welding to take place.

Below is the article, where i mentioned the types of welding defects with their causes and remedies. The flux is there to protect the metal to be welded, and the consumable filler will harden and fuse the two pieces together with a strong joint. As the electrode melts, the flux coating breaks down to perform several functions. I have written the topic in very easily understand language as well as i attach a pdf file of this article so that after reading you can download the pdf for your offline studies. Having the ability to create a balled tip when used in ac welding and yet still retain their sharpness when used in dc welding makes them a valuable electrode to have. E31015,16 dc, ac f, v, oh, h welding type 310 and 314 stainless steel where high corrosion and elevated temperatures are required e31615,16 dc, ac f, v, oh, h welding type 316 stainless steel and welds of highest quality.

Best welding method for beginners, the 15 minute guide. A variety of welding rods, including 6011 and 7018 rods, offer different features. Coating, current and polarity types designated by the fourth digit in the electrode classification number. These types of welding electrodes are also referred to as refractory electrodes.

It offers great arc stability and is best to be used for ac pipe welding that requires deep penetration and xray quality welds. With a slightly heavier slag covering, try to keep the arc in the puddle. For general purpose welding, 60 welding produces a smoother finished weld bead. Understand the different types of electrical currents and the proper current selection in using different welding electrodes. An electrode holder is used to hold and supply current to the stick electrode, causing it to melt and deposit molten metal. It is used for farm equipment, piping, wrought iron, and many kinds of general maintenance. Smaw is a welding process that uses a flux covered metal electrode to carry an electrical current. Shielded metal arc welding rods types of welding rods. The ph electrode depends on ion exchange in the hydrated. This type of electrode is often employed for general welding applications that do not call for any special features. All welding is carried out on the welders own risk and account. The intense heat generated with this arc melts the base metal and allows the joining of two components. And the best amperage setting depends on a rods diameter.

Used on furnace pares, aircraft components, heat exchangers and chemical processing equipment. Although mostly considered archaic nowadays, especially when compared to the tig and mig, shielded metal arc welding, or stick welding, is a manual welding technique that relies on a consumable electrode coated in flux that is then used to lay the weld. Carbon and lowalloy steel electrodes and types of welding electrodes. Difference between 6011 and 7018 welding rods sciencing. This type of welding is used in many industries, although its popularity is decreasing due to the introduction of. When it comes to polarity due to its coating this welding rod can only be used with a dc current. They also are used on farm equipment, piping, wrought iron and road equipment. Please note the following points in the use of this catalog. This is a copper coating on the electrode and there are different types too. It is made up of carbon and graphite and mostly used in the applications of cutting and arc welding.