UltraFlex induction heaters solder brass tube to galvanized steel pans within 25 seconds

PUBLISHED: 24 Jul 18

UltraFlex induction heaters solder brass tube to galvanized steel pans within 25 seconds
UltraFlex induction heaters solder brass tube to galvanized steel pans within 25 seconds

Several tests performed by UltraFlex Power Technologies showed that brass tubes can be soldered to galvanized steel pans within less than 0.5 minutes. It took only three tests to optimize the soldering results, identifying the best flux and induction heating process to be used.

All three tests had been performed using brass tube 67.31" (0.66mm) high and 0.037" (0.93mm) thick, with 1.5" (38.1mm) outside diameter. The tube had to be soldered to a 0.026" (0.66mm) thick galvanized steel plate using AlphaFry 0.125" (3.17mm) diameter lead free solid wire and soldering flux. Three types of soldering flux had been used in the testing, to identify the one performing best in this induction heating application: 95 Tin, 5 antimony AlphaFry soldering paste flux, 95 Tin, 5 antimony Rectorseal, Nokorode regular paste flux and 95 Tin, 5 antimony Harris Bridgit lead free burn resistant soldering paste flux.

The induction heating was done using a 5 kW Induction Heating system from the UltraFlex UltraHeat SM series. This is a compact induction heating system, easy to tune to a wide range of loads and coils and capable of delivering full power in the 30kHz - 200kHz frequency range. In this case, power of 2.5 to 2.9 kW had been used to reach a target soldering temperature of 420°F (215°C).

In the first test case, where 95 Tin, 5 antimony AlphaFry soldering paste flux was used, the surface coating was first removed using sand blaster. During the induction heating, adjustments of the tube position in the coil were applied to prevent melting of the top of the tube. Power was also turned on and off to avoid overheating of the tube.

The first test case showed that the flux used was too flammable. The solder flow was, in addition, a bit uneven, favoring one side. This was also due to the fact that the part had been heated before. It took up to 25 seconds for the entire solder cycle.

In the second test case the soldering set up was optimized by skipping the sand blasting of the surface and heating the part plus applying some alloy at the solder joint beforehand. The induction coil was positioned at the center of the brass tube and the induction heating continued for 15 seconds without overheating the part. This test resulted in improved spread of allow around the part and good solder joint, even though one piece of the alloy did not entirely melt.

In the third test the steel pans had an additional pan inside, to help keep the brass tube in the correct location. A new part, not exposed to any heat, alloy or flux had been used.

The additional pan added extra mass to the part and created an additional heat sink. Overheating of the tube was possible in this case, so power was turned on and off.

This third case showed the best solder results, with solder flow evenly flowing around the tube.

In all three tests, temperature controller and temperature monitoring system had been used to eliminate the possibility of overheating and damaging the parts. UltraFlex engineers confirmed that if a lower, 2 kW induction heating unit had been used, the process could be achieved in a similar timeframe but with lower risk of overheating the parts and better solder alloy flow.

This demonstration proved how fast it is to optimize the soldering process using induction heating - changing different parameters and evaluating results achieved within minutes. In addition to replacing traditional flame-based heating solutions, UltraFlex induction solutions can help reduce manufacturing costs, increase energy efficiency, improve safety, and meet lean manufacturing objectives.

Ultraflex Power Technologies, USA
Tel: + 1 631 467 6814
Email: sales@ultraflexpower.com
Web: www.ultraflexpower.com

More news from this company:
UltraFlex induction heaters solder brass tube to galvanized steel pans within 25 seconds
UltraFlex successfully brazing aluminum rails radiators using induction heating
UltraFlex announces the release of their breakthrough SmartPower Compac Systems
Un-brazing and re-brazing copper angle brackets to copper strips at 760°C in less than a minute
Using Induction Heating to simultaneously solder two brass tubes to a brass water jacket assembly within 70 seconds
Brazing corrugated tubing to stainless steel pipe and cap using UltraFlex Induction Heating
Brazing of heat exchanger pipes
Induction braze copper and brass lap joint
Preheat magnetic steel strip with very even heating across the strip
Induction heating system delivered for automotive parts supplier
Soldering copper pins onto a PCB
Induction preheating of brass rods before hot forging
Induction soldering of PCBs with soldering paste
Ultraflexappoints Reynaldo Alves South American Sales Representative
Induction brazing steel to wolfram carbide