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wettability of this nozzle would produce a large contact angle such as in Figure 2 (c). For wetting between the liquid solder
and the nozzle, there must be a clean inter- face with minimal surface oxides on the noz- zle. The presence of oxides on the surface interferes with the wetting of the solder to the surface by acting as a barrier; additional- ly, the surface energy of oxides is too low for wetting to occur. Flux is used to remove oxides and gener-
ate/maintain this clean interface before and during operation. After cleaning, a chemical reaction between the solder and nozzle deter- mines the extent of the wetting but this inter- action also limits the lifetime of the nozzle. It
causes wear of the nozzle and metal is leached into the solder bath.
April/May 2023
Selective Soldering: Need for Innovation and Development Continued from previous page
Exposure to the solder and the subse-
quent reaction alone does not cause signifi- cant wear. The contribution of liquid flow increases the wear in a synergistic effect which suggests that the underlying mecha- nism is complex corrosion-erosion. Therefore, a good nozzle must have good
Figure 3: an example of a wetted nozzle.
wettability to solder ensuring that control can be maintained during the selective sol- dering process in addition to a balance between the corrosion and wetting. The com- position must be chosen carefully in materi- als to achieve this. For example, extremely wettable materials such as copper have a high dissolution rate and will therefore be completely leached into the bath within hours demonstrating the link between the wear process and wetting.
Continued on next page
PREMO: 11 kW LLC Set for Onboard
Charging MALAGA, SPAIN — PREMO has released its new series BCBM-11KW-004, an 11 KW LLC set with combined trans- former and resonance inductor specifically designed for on-board chargers.
On-board chargers are typi-
cally integrated into the vehicle’s powertrain and require trans- formers to convert the AC power from external charging stations or home charging units, into the DC power needed to charge the vehicle’s battery. Premo has developed an effi-
cient triple 3.6 kW LLC (suited for 400V Input) set with transformer and resonance inductor specifical- ly designed for on-board chargers capable of handling up to 11 kilo- watts of power. Its compact design, durability, and high effi- ciency make it a popular choice among OBC manufacturers. The BCBM-11KW-004 series
is a high-reliability and high-effi- ciency solution designed to mini- mize energy losses during the charging process. This can be par- ticularly important for electric vehicles, where efficient use of energy can help to maximize the vehicle’s range and minimize charging times. PREMO has developed a
fully automatic manufacturing process for this kind of part design. The current production, deployed in two different plants (Vietnam and Morocco) is fully automated by using cobots from PREMO Robotics™. Contact: PREMO S.L.,
Severo Ochoa 47, Parque Tecnologico de Andalucia, 29590
Campanillas, Malaga, Spain % +34-951-231-320 E-mail:
rocio.arrupe@
grupopremo.com Web:
www.grupopremo.com
See at PCIM, Hall 6 Booth 232 See at EWPTE, Booth 1026
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