You will need
  • apparatus for electric welding, welding electrodes Ø2-3 mm, sheet metal thickness of 0.8-1.5 mm copper strip.
Welding of thin metal lap
Overlay welded plates on top of each other. The overlap of one sheet to the other depends on the smoothness of the edges. It should be such that throughout the junction ensure the overlap of at least 5 mm.

Get tight fit the edge of the top sheet to the bottom using clamps or smashing loads. The gap between sheets should be deleted, because its presence will lead to the burning of the top sheet.
Set the desired welding current
The magnitude of the current depends on the thickness of the weld metal and electrode diameter. For steel 1 mm thick, it should be 30-50 A. the Smaller values are taken for the electrode Ø2 mm, large – electrode ø 3 mm.
Before you begin welding the parts, practice on a similar thickness piece of metal. Trial welding will allow a precise adjustment of the welding current, depending not only on the values set on the device, but also on the voltage. In addition, the trial welding "customize" your own reaction, because you have to cook, constantly quenching the arc and igniting it again, and the slightest delay in otdelyvanija electrode will lead to the burning of holes in the metal.
Tack the sheets to each other.
Stuck is a short jumper seam (about 5-10 mm) with a distance between them of 50-100 mm all along the junction. Weld with periodic interruption – arc quenching (otdelyvanija electrode) and quickly turning it back on so that the metal does not have time to cool down. A continuous burning time of the arc depends on the thickness and amperage. For sheet thickness of 1 mm and thinner than it should be 1-3 seconds.
Cook the leaves completely
Boil the junction of the interrupted suture, from time to time by moving the electrode in a new (cold) zone of the joint. This is to avoid the strong warping of the metal – especially if the length of the joint is relatively large (more than 200-250 mm). The smaller the length of the continuous suture, the less warping. Start cooking from one side of the junction, then go to the other side, then move to the center, etc.
Welding thin metal butt
Achieve the minimum clearance between the edges of the steel along the entire length of the joint. The ideal case is the total lack of clearance. For welding thin metal butt use the temporary lining which is placed under the joint. Cooking thin (1 mm or thinner) steel butt unlined quite difficult, although in the presence of the welding inverter and a good (imported) electrodes is possible. The technology of the welding selection of the welding current, the use of clamps, intermittence and serialization welding) remains exactly the same as when the overlapping welding.
Welding steel fixed lining
If part design allows a fixed lining that is placed under the joint of strip steel of the same thickness as the base sheet of a width 13-15 mm. Provide a snug fit thereto the metal being welded. This lining will cook the item, even if the joint will be a gap of a few millimeters. The lining in this case is welded to the part.
Welding with copper lining
If naujasodes lining is unacceptable, put the joint strip made of copper (the thicker, the better). Copper will take the heat and prevent burning the leaves. After welding, remove the lining.
Welding steel retractable lining
If neudalyayuschiysya lining is invalid, and the copper strip no weld detail with steel backing and carefully remove it grinder.