Induction Soldering Stainless Steel Tubing with IGBT Soldering Heating Units
Objective Heat a.125ā (3.175mm) diameter stainless steel tube to a 1āĀ diameter cylinder 1ā (25.4mm) tall for a soldering application
Material Stainless steel cylinder and tube
Temperature indicating paint
Lead free solder preform rings
Temperature 300-400 ĀŗF (150-205 ĀŗC)
Frequency 235 kHz
Equipment DW-UHF-4.5 kW, 150-400 kHz induction power supply,Ā equipped with a remote heat station containing two 0.66 Ī¼FĀ capacitors (total 1.32 Ī¼F).
A three-turn pancake coil induction heating coil designed andĀ developed specifically for this application.
Process Initial tests without solder ensured that the metal reaches theĀ required temperature and the heating pattern on the part.Solder preform rings are placed onto the tube at the joint. TheĀ part is placed inside the induction-heating coil heated until theĀ solder melts.
Results/Benefits Programmable and adjustable heating ramp rates achieve theĀ desired heat profile. Too fast a heat profile does not conductĀ the heat through the joint and too slow a heat cycle vaporizes
or dries the flux causing poor solder flow.
