A detailed look at welding of a thermoplate
At the heat of our technology is the thermoplate also called pillow plate or embossed plate due to the shape of plates after expansion. The thermoplate is a fully welded heat exchange plate.
Material selection is of course key when selecting the right design for a heat exchange duty.
But another key factor and sometimes more important factor is the welding of the thermoplates, a thermoplate can have several hundred spot welds. Each a potential risk for corrosion or fouling if not handle with care.
We at ATHCO-Engineering use resistance welding to produce the spot pattern and the seam welding for the thermoplates.
The resistance welding has a few key benefits compared to other welding techniques
- No add material to weld
- Limited pollution of the metal sheets.
- The corrosion and strength of the materials are maintained
- No visible welding seems
- Hence no nucleated spots for fouling, corrosion and freezing
- No crevice – highly susceptible for corrosion
- Only a low heat input at the welding spot
- The strength and corrosion resistance of the heat affected zone is nearly that of the parent material
- No space behind the welding
- No risk of corrosion in between the weld metal sheets
This is of course only true when the resistance welding is conducted correctly. We at ATHCO-Engineering have more than 40 years of experience with the resistance welding for thin materials.