However, the amount of suspended liquid metal could be reduced from the 60-80% range to 30% by proper
fluxing and dressing techniques.
Then 480 g of a slag (579 g in case of slag D) is formed on top of the liquid steel to which then 120 g of the
fluxing materials (21 g in case of Ca[F.sub.2] for slag D) as grains of 3-6 mm are added (Table 3).
Under the revisions, facilities can seek approval for alternative monitoring that fully demonstrates compliance for
fluxing and lime injection operations without regard to the technical or economic feasibility of the procedure specified in the rule.
During a four-year period, degassing and
fluxing trials and evaluations of molten metal cleanliness were conducted in green and nobake sand, low pressure, semi-permanent and permanent mold casting facilities.
In selecting a spray
fluxing system, one must consider the complexity of the circuit boards being processed in a lead-free environment.
Manual
fluxing with solid flux chemical compounds has its merits, but environmental and personal health concerns have greatly impacted flux usage and practice, and flux injection processes are now more commonly utilized.
* Detailed are the melt operations of two aluminum casting facilities, including charging,
fluxing and degassing.
Fluxing is a critical parameter in the wave soldering process, and with the introduction of Pb-free soldering, flux can determine whether the process is sucessful.
* Powder and granular
fluxing techniques are presented, providing details on flux chemistry and composition.
First, Pb-free solder wetting is poorer, and non-wetting often occurs with no-flow
fluxing chemistry, particularly in the case of OSP finishes.
Spray
fluxing applications are not immune from problems during Pb-free solder processing.
This slag also contains
fluxing material and increases the danger of flux attack.
