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Laser Welding

Laser Guide - Laser Welding
Most Efficient:

Making thermal calculations does not have to involve an added weld wire or its splatter and so contributes and promotes to greater heat transfer efficiencies


Added wire 1 - Laser Welding
Added wire 2 - Laser Welding


no added wire 1 - Laser Welding
no added wire 2 - Laser Welding
Because the laser process does not use a foreign weld wire, there is no added weight. Only the fin or rib and the pipe
added fillet - Laser Welding
The measured difference in surface area is 2mm2, multiplying this by the length of the weld we get a saving on weight per 1 meter 0.76 kg. or .51 lbs. per foot
Full Penetration of Weld:
Due to the laser process, the entire length of the fin and pipe become “one metal” as there is no added weld wire or the required shield gas for the welding process.


adms 2013 0009 4b - Laser Welding
Poor connections also cause problems when calculating the efficiency of the heating system


adms 2013 0009 8c - Laser Welding
When calculating the efficiency of the system, the thickness of the rootcan be used for making the pipes can beassumed.
No Gap Between Fin and Pipe Wall:
There is no void between the fin root and pipe wall which can cause crevice corrosion, an attack that usually takes place in a very tight gap between two surfaces. The gap can promote cold spots and therefor corrosion.
added fillet 1 - Laser Welding
Gap can lead to “crevice corrosion”
arrow - Laser Welding
adms 2013 0009 5b - Laser Welding
Precise, Distortion Free Welds:
Laser is precision tuned without interference of wire or shield gas. Complete melt of the fin to pipe connection along the entire length of the fin
Better Weld Control for Joining Dissimilar Metals:
Precision tuned per application
Less Splatter:
Cleaner and smoother surfaces will promote better heat transfer, less pressure drop and less opportunity for particulate buildup, no matter how small the blemishes appear to be.
splatter free - Laser Welding
Uniform Root Hardness:
Other welding methods can leave uneven hardness throughout the fin to pipe configuration.


Comp hf hard - Laser Welding
Comp hf hard chart - Laser Welding
Hardness values (HV) significantly exceeds the allowable values allowed for pressure equipment (max. ≥ 380 HV)


Comp laser hard - Laser Welding
Comp laser hard chart - Laser Welding
Hardness values (HV) does not exceed the allowable values allowed for pressure equipment (max. ≥ 380 HV)
  Pass The Strength Test:


Comp hf strength 1 e1570273363664 - Laser Welding
Comp hf strehgth 2 e1570273466210 - Laser Welding
Due to the poor quality of the connection between the tube and fin, a proper rupture test cannot be made. In this instance, simple gripping tools were used to pull the fin away from the tube. In some cases, during a cutting trial, the fin broke away easily from the tube.


Comp laser strength 1 e1570273597846 - Laser Welding
Comp laser strength 3 e1570273658437 - Laser Welding
Tensile testing of laser welded samples showed that all samples broke in the tube material and not at the weld. Proving the high quality of the weld joint. The average tensile strength is 320Mpa / 3200 bar.div>

From a manufacturing perspective:

Laser welded finned tubes are manufactured and comply with the highest requirements

Does not require the use of welding wire

Elimination of shielding gases in the welding process

Improved manufacturing efficiencies

The manufacturing process is designed to operate in continuous production mode which translates into no interruptions in the technological process as required.

All lead to significant reduction of manufacturing costs


Processing lines of finned tubes laser welding can be assembled into production line systems in order to increase the production capacity.

ready to ship - Laser Welding