Objective Preheat low carbon steel rivets and handrail bars for reforming for construction
Material Low carbon steel rivets 7/16” (11.1mm) dia x 1.5” (38mm) & 1.9” (47mm) long, low carbon bar 1.25” (32mm) dia x 3” (75mm) heat zone
Temperature 1922 ºF (1050 ºC)
Frequency 48 kHz for the rivets 55 kHz for the bars
Equipment · DW-HF-25 kW induction heating system, equipped with a remote workhead containing two 1.5F capacitors for a total of 0.75F
· An induction heating coil designed and developed specifically for this application.
Process A Three turn encapsulated helical coil is used for the rivets and a four turn encapsulated helical coil is used for preheating the handrail bars. The rivets are heated to the 1922 ºF (1050 ºC) in
22-25 seconds and the bars are heated to the 1922 ºF (1050 ºC) in 4 mins 43 seconds.
Results/Benefits Induction heating provides:
· Controllable heat pattern
· Ease of on site location use
· Safe, no open flames
· Even distribution of heating