Regarding pre-welding heating methods?
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Regarding pre-welding heating methods? What methods are generally used for preheating thick-walled cylinder shells before welding?
Preheating methods before welding include: 1. Flame heating 2. Electric heating. **Flame heating: 1. Oxygen-acetylene heating 2. Preheating with crawler-type heating bands 3. LPG preheating. The preheating method commonly used in manufacturing plants is flame heating, as it is simple to implement.
The method mentioned above is quite comprehensive; as an additional point, infrared heating can also be used； Small welded parts, such as pipes and flanges, can also be heated using an oven ； Each of the above heating methods has its own characteristics. Flame heating can achieve high temperatures and is simple to operate, but temperature control is not precise ； The heating temperature of electric heat strips is generally within 300 degrees, with accurate temperature control; however, it presents difficulties when dealing with irregular shapes ； Flame heating may cause uneven heating and oxidation on the workpiece surface, while electric heating is more stable.
The original poster explained it clearly: “Preheating is required before welding thick-walled cylinders of containers – what methods are generally used?” " What was said above refers to small-scale welding heating, and it has little to do with the original question. The poster didn’t specify how thick the material is, which might be the reason for the misunderstanding. In factories, flame heating is generally used for such workpieces, as it’s convenient and simple.
As far as I know, there are resistance heating and flame heating; the flame preheating method is generally used, but it’s a simple process whose temperature is difficult to control, so a temperature sensor must be employed to ensure the quality of the product.
I agree with what was said on the 3rd floor, but every method has its drawbacks; we need to consider the actual circumstances. The infrared preheating method is one that deserves to be promoted. You also pointed out that my answer wasn’t comprehensive – after all, ordinary manufacturing companies don’t have the resources for such things; who wouldn’t try to save costs? Heating with flames is already a common practice; simple temperature measurement devices and experience are sufficient to meet the requirements.