Let’s test everyone: 4. Methods for processing, manufacturing, and welding coiled tubes and semi-coiled tubes
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bg4.png Let’s test everyone: 4. What are the methods for processing, manufacturing, and welding coiled tubes and semi-coiled tubes? What are the processing and welding methods for coils on a cylinder? What are the processing and welding methods for coils when they are on the head? What are the processing and welding methods for a semi-coil on a cylinder? What are the processing and welding methods for a half-coil at the head?
When welding the semi-tube jacket to the cylinder, it is necessary to ensure that the grooves are regular and consistent. During welding, a φ2.5 electrode should be used for the root pass, followed by a φ3.2 or 4.0 electrode for the cover pass; welds of this type are prone to cracks that are not easily visible to the naked eye. Care must be taken during welding, and the electrodes must be properly dried to avoid any leakage issues
When the semi-coil is used on a head, it can be fabricated by first bending a solid circular tube into sections, then cutting them into semi-tubes, which are subsequently welded to the head using TIG welding. When the semi-coil is on the cylinder, it can be manufactured by stamping steel plates using molds, and then welded to the cylinder with TIG welding.
I’ve heard colleagues say the same thing: handshake
When a semi-coil is used on a head, it can be manufactured by first bending a solid circular tube into sections, then cutting them into semi-tubes, which are subsequently welded to the head using TIG welding； When the semi-coil is on the cylinder, it can be manufactured by stamping steel plates using molds, and then welded to the cylinder with TIG welding
I have done many at my previous employer.
Half-coil devices are rare, mainly to avoid regulation. The manufacturing cost is high, it is prone to defects, and the results are not that ideal. Jacketed or internal coil designs are generally used.
Are devices with outboard coils not very common? There are full circles and semi-circles, as well as those made of angle steel. Doesn’t your company manufacture many chemical processing equipment?