Plastics Plastics are replacing metals, steel and other strong metals used in construction. They are now used in the home, in gas engineering, farming, sportsequipment, and in the automobile industry etc. Equipment made of plastic is lighter than that made of steel, and since welding and fabrication is relatively easy and the costof repair lower, it will be well to consider some of the processes involved. Plastics are derived mainly from oil, coal and wood. Polystyrene and polyvinylchloride (PVC) are examples of those derived from oil and coal while the […]
Gas cutting of iron and steel Iron and steel can be cut by the oxy-hydrogen, oxy-propane, oxy-natural gas and oxy-acetylene cutting blowpipes with ease, speed and a cleanness of cut. Principle of cutting operation There are twooperations in gas cutting. A heating flame is directed on the metal to be cut and raises it to bright red heat or ignition point. Then astream of high-pressure oxygen is directed on to the hot metal. The iron is immediately oxidized to magnetic oxide of iron (Fe3O4) and, since the melting pointof this […]
Metal inert gas (MIG), metal active gas (MAG) including CO2 and mixed gas processes The MIG semi-automatic and automatic processes are increasing in use and are displacing some of the more traditional oxy-acetylene and MMA uses. For repair work on thin sheet as in the motor trade, semi-automatic MIG using argon–CO2 mixtures has displaced the traditional oxyacetylene methods because of the reduced heat input and narrower HAZ, thus reducing distortion. For larger fabrication work, mechanical handling equipment with automatic MIG welding heads has revolutionized the fabrication industry, while the advent […]
The electric arc welder and it’s operation An electric arc is formed when an electric current passes between two electrodes separated by a short distance from each other. In arc welding (we will first consider direct-current welding) one electrode is the welding rodor wire, while the other is the metal to be welded (we will call this the plate). The electrode and plate are connected to the supply, one to the + ve pole and one to the – ve pole, and we will discuss later the differencewhich occurs when […]
Have you ever been searching welders for sale Perth or even welders for sale WA ? If so then you have come to the right place. We specialise in all types of arc welding machines including arc and combination tig welders, inverter welders and plasma cutting supplies. We ship to Perth and all of Western Australia daily direct from our warehouse at Wyong 2259 NSW which is midway between Sydney and Newcastle. We have many different welding machines for sale along with PPE and other equipment which is of course […]
Have you spent time searching the internet for welders for sale in Darwin or even welders for sale NT Northern Territory ? Now that you have discovered us, you have come to the right page. We are specialists in all manner of tig welding machines including arc and combination mig welders, industrial inverter welders and plasma cutting machines. We ship to Darwin and all of the Northern Territory daily directly from our warehouse in NSW located on the sunny Central Coast at Wyong 2259 NSW which is midway between Newcastle […]
If you are searching welders for sale Melbourne then you have come to the right place. We specialise in all types of welding machines in cluding tig and mig welders, inverter welders and plasma cutting equipment. We ship to Melbourne daily direct from our warehouse. We have many types of welding machines for sale along with PPE and other equipment. Customers in Victoria may call us on our direct number 03 9008 0331.