[ILLUSTRATION OMITTED] Key Process Parameters Conveyer Speed: 1.25 ft/min Total Contact Time: 11.5 sec Solder Temperature: 525[degrees]F Peak Topside Temperature: 133[degrees]C Duration (ambient to wave): 5:18 Preheater Location & Type Zone #3 Zone #2 Zone #1 Set Point Set Point Set Point ([degrees]F) ([degrees]F) ([degrees]F) Top: Calrod
380 470 470 Bottom: Forced Air 330 380 380 FIGURE 4.
As can be seen, the calrod
system provides a passive heating that ensures the flux dries out and remains in place.
Hotpoint's first ranges with this feature came with only one 6-inch Calrod
Because natural gas is abundant and cost-effective in the midwest, conversion from electric calrod
heat source is expected to reduce the company's utility costs versus electricity.
Depending on the type of production, the third preheat zone can be hot air, infrared lamps (special for mixed production) or calrod
"It uses less energy than a traditional calrod
, so preheating times are completely eliminated," he claimed.
Units utilize a solid-bed design with low-watt-density Calrod
In other developments, Enrietti is machining its manifolds in two halves, which reportedly allows runners to be fabricated in smoothly curved channels, and is using Calrod
heaters to provide uniform heat transfer.
By contrast, electric-powered quartz or Calrod
i-r elements at surface temperatures of up to 1800 F emit shorter (2.25 micron peak) i-r wavelengths, which aren't as well absorbed.
Manifolds are now available with optional Calrod
heaters rather than cartridges, which reportedly can help to concentrate the heat where it is most needed.
The units utilize a solid-bed design with low-watt density Calrod
Oven temperatures are measured from thermocouples on heating elements (quartz, Calrod
, or ceramic) and can be adjusted from a keyboard while the machine is running.