Brazing Copper Assemblies With Induction

Brazing Copper Assemblies With Induction Objective:To heat copper ‘T’ assemblies to 1400(760) ºF(ºC) for brazing Material: Copper ‘T’ assemblies,Silver-copper eutectic braze,White flux Temperature: 1400(760) ºF(ºC) Frequency: 250 kHz Equipment: DW-UHF-20KW, 450 kHz solid state induction power supply with a remote heat station containing two 1.32 mF capacitors (total capacitance 0.66 mF). A custom-designed induction heating coil. Process A custom double-wound pancake-helical coil combination is used to efficiently transfer RF Induction Heating power. Tests were conducted using temperature indicating paint to establish heating profiles and time-to-temperature. After the optimum time-totemperature of 3-5 minutes is established, a braze ring is placed at the joint and white flux applied to the joint area. The first joint on each piece takes 5 minutes with subsequent joints on the same copper piece taking much less time (~3 minutes). Results/Benefits · Semi-automatic process reduces amount of operator laborinvolved· Easy and effective completion of braze joints https://dw-inductionheater.com/brazing-copper-assemblies-with-induction.html?feed_id=252562&_unique_id=66864b35df3a6

Brazing Thin Copper Tube With Induction

Brazing Thin Copper Tube With Induction  Objective: To braze a thin copper oval tube to a brass fitting at 1400 º F and to cap the other end of the copper tube with a brass plate. Material: Brass fitting - 0.875 in2 and 2.5 in long (22mm2 x 64mm) Copper tube 0.01 in (0.254mm) wall Brass plate 0.10 in (2.54mm) thick and 0.5 in X 0.25 inch Braze alloy shim and white flux Temperature: 1400 ºF (760 °C) Frequency: 300 kHz Equipment: DW-UHF-10KW induction power supply equipped with a remote heat station using two 1.32μF capacitors (total 0.66 μF) Two custom-designed induction heating coils. Process A split, f our-turn induction coil is used to deliver the heat energy into the brass fitting (Fig. 1). To prevent over heating of the edges of the brass fitting and the thin copper tube, a smaller coil diameter (Fig. 2) was added to deliver heat into the brass fitting. A braze shim preform is placed at the joint area, and is then covered with white flux. The height of the coil is adjusted to deliver proportional heat to the assembly. This setting raises the temperature of the thicker brass piece and the thin copper tube at the same rate enabling a uniform flow of the braze shim preform. The other end of the copper tube is brazed successfully using a 2-turn helical coil (Fig.3.) Results/Benefits • Preservation of the copper's mechanical properties • Minimized heat migration along both ends of the tube • Reduced heat-up time (under 60 sec.) https://dw-inductionheater.com/brazing-thin-copper-tube-with-induction.html?feed_id=252494&_unique_id=6685947e7ce60