2/method of frequency straight seam welded pipe welding.
- Two Types of lathe Machine
- What is a welded seam?
- straight seam welded pipe
2/method of frequency straight seam welded pipe welding.
- What is a welded seam?
A welded seam is a seam that is made by welding two pieces of metal. There are many types of welds and the most common ones that you will see are the heat and arc welds.
The Heat and arc weld is the most commonly used method of welding but it requires the use of a welding torch that is directed at the metal and the flame.
Arc welding A process in which two wires of a high voltage arc are then connected together by a crossbar to create a welded seam
Flame welding Flame welding can only be done with an electrically powered welding gun. The problem with this method is that if the wire that goes into the gun is the wrong length then there will be a hazard because the wire is higher than the surface of the metal that is being welded. This will heat the metal enough to burn it. There are two types of flame welding, induction and pneumatic.
Plastic welding This is also known as weld bonding and you can do this with wires, metals, or fabric.
The wires used for this are soft materials such as nylon, polyester, and spandex. You will use the same equipment and process for both electrical and gas arc welds.
2/method of frequency straight seam welded pipe welding.
- Straight seam welded pipe
Two methods of high frequency straight seam welding: contact welding and assignment welding
Contact welding is a pair of copper electrodes that are in contact with both sides of the welded steel pipe. There is good current interference of motivation. Because the copper electrode is in direct contact with the steel plate, the two effects of high frequency current are larger. Therefore, high power consumption and low power consumption are widely used in the production of high speed and low precision pipes. In general, especially when producing thick steel pipes, contact welding is also required.
However, there are two disadvantages of contact welding However, there are two disadvantages of contact welding. First, the copper electrode comes in contact with the steel plate and wears rapidly.
Second, due to the influence of steel plate surface flatness and edge flatness, the current stability of contact welding is poor, and the burr inside and outside the weld is high. It is not commonly used when welding with high precision and thin walls. Wall tube.
Coil welding uses one or more turns on the outside of the welded steel pipe Multi-turn is better than single-turn, but it is more difficult to manufacture and install multi-turn coils. Due to the small distance between and the surface of the steel pipe, high efficiency, but it is easy to cause a discharge and between the steel pipe. It is generally recommended that the corresponding coil be 5 to 8 mm from the surface of the steel pipe When the appointment welding is used, because since the appointed coil does not contact the steel plate, there is no wear and currently, thus is relatively stable to ensure stability during welding. The surface quality of steel pipe is good during welding, and the weld seam is flat. When precision tubes are used, used welding is mainly used.
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