One of the most widespread types of welding – induction welding at which position of joints of the welded parts at first heat up to plastic state and then connect together, forming new part. How to make such welding?
1. Depending on part type, choose suitable type of welding. Distinguish welding dot, sutural and connection. Dot is the most suitable for connection of the whole sheets of metal of rather small thickness. Connection most often use when welding tubular constructions, and sutural – at production of sealed containers, for example tanks where especially strong seams are required.
2. That to make spot welding, execute the following operations: clamp the connected parts between electrodes which have the form of truncated cone with diameter no more than 12 mm, and pass through them electric current. On the place of joint the so-called "welded point" which by the form reminds rivet is formed. That connection was stronger, it is possible to put several such rivets. Machines for performance of spot welding are rather widespread.
3. Butt-seam welding is very often carried out at connection of polypropylene pipes. For this purpose place thermoelement between both ends of the welded pipes. When pipes very strongly are warmed and their ends will become flexible, remove thermoheating coil and under pressure densely press the ends of welding surfaces to each other. Very dense hermetic seam is as a result formed.
4. When performing sutural welding of preparation connect among themselves the seam consisting of set of points. In this case impose both preparations at each other and clamp them between electrodes. Give current, and the metal which is in contact zone will begin to melt. Roll preparations between electrodes to achieve emergence all of new welded points which can block or not block each other. Distinguish continuous, intermittent and step-by-step welding. In the first case of part connect continuous seam, in the second – at first one cast zone is formed. At step-by-step welding of part move falteringly, and current moves only when rollers are stopped.