Though some foreign are being used by the Structural and roadside in , some of them still prefer the made in type. There is no significant difference on welded joints made by the foreign from that of the domestic type. have various sizes and power output in both its foreign and domestic categories.
The issues that most arc welders face when trying to purchase a welding machine is to know the best quality of the actual size they are buying. When low-quality machine is used to weld thick metals the welded joint will not be strong because it will not fusion well. For a welded joint to be strong the machine should be able to generate enough heat that can easily melt the two joints when they are close and its electrode pass through them, otherwise only the electrode will deposit its melted content into the joint which is capable of holding the joint together but such joint may breakup later when heavy impact fall or hits it. For the above reason, let us discuss what a welder must decide before making a choice of the type of to be acquired, bearing in mind that the higher the quality and size the costlier it becomes.
WHAT A WELDER MUST CONSIDER BEFORE BUYING ARC
- What size of metals will the welder be working with frequently? Yes, that is an important factor to avoid waste of resources, a welder that will be working on lights steel plates that will not be thicker than 2mm will not require the same with a welder working with thicker steel plates and beams up to 10mm thickness. Consider the chart below, it reveals the recommended voltage and current for each metal thickness during . Therefore, to avoid waste of resources know your limit of working materials so that you can make the right choice in selecting the required .
- What kind of electrode will be used frequently? Knowing the size of the electrode to be used frequently by the welder will assist in making a better selection. There are two popular electrodes in the Nigerian market, they are called the gauge 12 and the gauge 10 these two are the most common in the Nigerian welders’ material shops. The Gauge 12 is smaller in size about 1.5mm thickness while the Gauge 10 is bigger about 3mm thickness. It is not every locally made in that can weld the gauge 10 electrode effectively because of its thickness, such electrode requires high voltage, therefore needs high-quality . While the gauge 12 is the standard that most roadside use for their works.
- What is the voltage of the in the workshop? This is another factor a welder must consider before making a choice on the size of the welding machine to be acquired. The domestic electric power supply in Nigeria is between 200volts to 220volts while the industrial electric power supply in Nigeria can be up to 400volts which is usually referred to as three-phase power supply. These two power supplies vary in terms of volts and current, and every welding machine has its voltage rating and acceptable power input, hence; it will be unwise to use a low quality or low voltage rated welding machine on the industrial electric power supply because it has the ability of causing severe damage to the . Neither is it wise to use high quality or high voltage rated on domestic electric power supply because it will definitely give out poor performance and can also damage the .
- What type of to be used? Yes, that is very important beside some that use larger power supplying generators, the popular generators used by in is the S195 and the S1115 . They are all but their power output depends on the size of the generator coil attached to them. Basically, S195 can carry 7.5 KVA generator coil which can carry the low-quality effectively and welds gauge 12 electrodes correctly, but it may not do well when using it for superior . While the S1115, have superior power and higher RPM in its power output, therefore, it can carry up to 10 KVA generator coil which makes it ideal for superior and for gauge 10 electrodes.
Having gone through the considerations required to make your selection, let us discuss in details things you must look out for on any size of the you will choose.
THINGS YOU MUST LOOKOUT FOR IN THE SELECTED MADE IN .
- Power output: the power output during the to know if it is the specified power and how efficient the power can weld the materials you will be using to . Also note that some of such can have their power output affected due to the power input, that is; if the voltage that went into it is low then the output voltage will also be lower than the specified rating. But if the voltage is between 200-220volts and the is not giving out the specified power output, then the manufacturer may be lying about the , make another choice of the same size.
- End connections: The end connections are the places that the used in winding the coils end and is being joined by another . Experienced manufacturers know that major discontinuity coming from the comes from those joints, therefore the joints or the ends are usually brought out from the main coiling such that they are visible at the top edges of the coil, the reason is to enable the welder to easily connect the ends whenever they disconnect as a result of overheating, thereby reducing the maintenance cost and the stress for the welder in regard to the frequency of taking the to technicians for repair. So a welder should look out for such design in the because it will be of help in the long run.
- Padding technics: This is the method which all the metal sheets used in the making of the coils were padded. The way the was padded is important if the padding has plastic plates at the outside then know that the plastic may melt after a period of time but if the padding was made with hardwood boards then it may last longer because it can withstand more heat than the plastic.
- Metal plate thickness and sizes: It is the thickness of the metal sheets used in the coil making which makes it form a kind of transformer design that makes some people call it . The metal sheets are usually while the outside will be attached with an insulator material such as plastic, , or wood board. It is assumed that low-thickness metal sheets in numerous numbers perform better in eliminating heats and increasing power output than few high-thickness metal sheets used in the coil. For that reason, consider selecting the with the low thickness metal sheets in their numerous numbers.
- The material of the : Most made in usually come with copper or aluminum in their coils. The two types of used for the coils can perform very well in jobs. The actual difference between the coil made of and that made with is size. Coils made with is smaller than that of . And coils of do have higher power output, durability and is more costly than the coil made with of the same size. So if there is an option to choose from the two go for coil.
- The number of turns: This one may be difficult to know since the welder may have no knowledge about it, however, the number of turns on the can reveal its quality. If the turns on each coil are few and the is aluminum , then the will have low power output, unless such coil was made with .
- Insulation materials used: Made in do have insulators in them just like its foreign counterparts, the insulators may be plastic sheets, leather materials, papers, sealing tape, clothes and latex materials. Whatever material used as the insulator the durability will rely on how the will be used, however, the types made of plastic, leather, clothes and sealing tape usually last longer before bridging inside.
- Base support and : It is another important factor that many people overlook. The is like a transformer when current through the the entire metal sheets in the coil will become temporary magnets which will make them attract any metallic object within the into the coil. For this reason, experienced manufacturers in usually make their to have a solid insulator material on their base such that when the is in operation there will be a good gap between the coils and its metals from the ground, such design should be considered. Also the should be noted, for such that has no top cover the may be the atmospheric air while those with top cover may have a small attached at one edge inside it, so that it can help to expel the heats that will be generated in the coil into the atmosphere, so consider the two cooling arrangement and ensure one is in the .
- Number of power outlets: Just like the gears of a , do come with different numbers of power outputs it may range from 1 to 5 or from 5 to 1 depending on the manufacturer’s arrangement, ensure there is a considerable number of such power output in the you want to buy otherwise you may have problem when trying to weld extreme low gauge plates like the 0.5mm metal plates
- The difference in the number of turns for each voltage increase or decrease: Having observed the number of the power outlets, consider the difference in the coil turns that led to the forming of each power outlet. A closer number of turns for the outlet means a little or insignificant change in the outlet’s voltage. But when the number of turns on the coil is much for each gap between the power outlets it will means significant power drop or increase, whenever the outlet socket is change.,
- Thickness of the : The thickness of the used in the coil making can affect the durability of the . with small diameter tend to cut inside due to overheating during the operation, but the ones of large diameter may not have similar problem, so consider buying the type with considerable diameter in their coils.
These points highlighted above will aid any intending welder to make a right choice in selecting a .
Originally posted 2018-04-29 17:28:58.
A mechanical engineer and an NDT inspector by profession. However, I love blogging and sharing of knowledge for human intellectual development, especially relating to engineering fields, environment, and science trending updates. “Engineeringall.com” is a platform for any individual with similar passion, to do so; use the “PUBLISH YOUR ARTICLE” page at the MENU to share your personal ideas, researched knowledge, or discovered incidents, etc.to those in the engineering & & the general online communities across the globe. If you love this post please share using the social buttons below.