Thin metal welding
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For successful welding of a thin sheet, some metal should be melted and then slightly cooled until the next batch is melted. This avoids the inevitable blowdown of the weld zone, during which the steel can be burned. In order to prevent this, the setting of the welding machine amplifier and wire feed speed should be reduced. Using a thinner wire (0.6 mm instead of 0.8 mm) will also help reduce the operating current of the process.
How to weld a thin metal
Using MIG technology, welding should be carried out with short impulses, in between which the melt will cool down. The minimum pause between pulses should not be more than 0.5 s, and with increasing pause the chance of getting the influx of cooled metal (which are formed between the seams) increases. The risks of using this technology lie in the fact that individual weld beads can not melt with each other, which practically guarantees a lower strength of the joint. Therefore, this technique is suitable for welding steel sheets at least 0.8 mm. For a thinner sheet, the TIG technology is used — welding using a tungsten non-consumable electrode.
Main features of welding
When welding large sheet panels (for example, a car), thermal expansion of the metal during welding can lead to distortion of the dimensions of the joined products. The problem is that the dimensions of such parts vary depending on the temperature (heating and cooling).
Distortions can be minimized if the metal is welded at intervals of, for example, 20 mm, and only welding of very short sections (less than 20 mm in length) is performed at a time, allowing the metal to cool between each section of the weld. If the seam is long, the first section can be on one end of the sheet, and the second on the other.
Optimization of the working cycle
Since the duty cycle will be much shorter than with conventional continuous welding in the same welding machine setting, the welder will need longer welding breaks so that the weld metal can cool down. Supplier Avek Global offers to buy rolled metal at an affordable price from the manufacturer in a wide range. Provide delivery anywhere in the continent. The price is optimal.
A good effect is provided by cooling the preforms prepared for welding with a damp cloth between the sections, or by using pads made of a material with a lower thermal conductivity (in particular brass), which are located under the place of the welding seam.
Buy. Supplier, price
Are you interested in welding thin metal? Supplier Evek GmbH offers to buy rolled metal at an affordable price from the manufacturer in a wide range. Supplier Evek GmbH provides delivery anywhere in the continent. The price is optimal.