Apparatus and method for providing an inerting gas during soldering
A technology of welding process and inertization, applied in the direction of welding equipment, welding equipment, auxiliary equipment, etc., can solve the problems of increasing the total cost of end users
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example 1
[0062] Example 1: Effect of Pore Size of Porous Conduit on Gas Flow Pattern
[0063] Three diffusers or perforated conduits with three different grade levels listed in the table below were tested. Lower grades represent smaller pore sizes and porosity of the diffuser. By making room nitrogen (house N 2 ) into each seamless porous duct and measured upstream of each diffuser at a given nitrogen flow rate (P u p) and downstream (P down ) to carry out the test. The pressure drop ΔP across the diffuser is determined as follows:
[0064] ΔP=P up -P down
[0065] Then, the average pressure along the diffuser is calculated as follows:
[0066] P ave =(P up +P down ) / 2
[0067] When ΔP / P ave Much less than 1, the flow out of the diffuser duct can be considered to be in a laminar flow mode. On the contrary, when ΔP / P ave Near 1, gas turbulence usually dominates. For some embodiments, it is preferred that the porous conduit provides a laminar gas flow pattern.
[0068] a...
example 2
[0072] Example 2: Effect of Heating Diffusers for Nitrogen Inertization in Wave Soldering
[0073] In this example, at least one of the porous conduits is located between two solder waves and has a metal fin inserted into a reservoir of molten solder so that the temperature of the porous conduit diffuser can be maintained at the melting point of the solder above. The heated diffuser can avoid potential clogging problems such as by solder splatter / freeze and by flux vapor condensation on the surface of the diffuser. An example of a configuration used for this experiment is Figure 9 shown.
[0074] Figure 19 available at Figure 18 Results for the oxygen concentration around the solder reservoir at positions 1 to 8 indicated in , with a static plate on top of the solder reservoir and no top cover (eg Figure 5 top cover shown in); Figure 20 Repeat the oxygen analysis, but with the top cover and vent (eg Figure 5 shown in ). Based on visual observations, any weld spla...
example 3
[0075] Example 3: Applying a Non-Adhesive Porous Sleeve to a Center Diffuser Duct
[0076] In this example, at least one of the porous conduits is located between two solder waves and has a metal fin inserted into a reservoir of molten solder so that the temperature of the porous conduit diffuser can be maintained at the melting point of the solder above. The heated diffuser can avoid potential clogging problems such as caused by solder splatter / freeze and by flux vapor condensation on the surface of the diffuser. An example of a configuration used for this experiment is Figure 9 shown.
[0077] The central diffuser duct is covered with a sleeve made of ePTFE (expanded polytetrafluoroethylene). ePTFE was formed into catheter shapes and white, manufactured by Phillips Scientific Inc., item number TB3000. The porous conduit is expandable only along the length of the conduit and not in the diameter direction. The material is capable of withstanding 315°C and has an average ...
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