Resistance seam weld
Applied to joint
Overlapping sheets — spot welds at interface
Download
Shop
Spot welding equipment
Pedestal and portable spot welders for sheet metal work.
→ weldingandwelder.com
Description
A continuous or semi-continuous resistance weld made by passing overlapping sheets between rotating wheel electrodes. Produces a gas-tight and liquid-tight seam. The welding current is applied continuously or in pulses as the wheels roll along the joint.
In plain English
Two copper wheel electrodes roll along the overlapping sheets, squeezing and passing current as they go. The result is a continuous line of overlapping weld nuggets that forms a leak-tight seam. Think of it as a continuous version of spot welding. Used for anything that needs to hold liquid or gas -- fuel tanks, radiators, cans, drums. The symbol is a circle with two horizontal lines through it (representing the wheel electrodes).
Symbol position
Circle with horizontal lines through it on the reference line.
Size notation
Seam width 'c' to the left. Length of seam to the right. Pitch if intermittent.
Notation examples
Minor symbol appearance variation between System A and System B, but both recognisable. Dimensioning is essentially the same.
Circle with parallel lines. Width and length specified.
System A and B both use circle with horizontal parallel lines. Width 'c' to the left.
Common uses
- Fuel tanks and pressure containers
- Radiator and heat exchanger fabrication
- Food and beverage can manufacturing
- Drum and barrel production
