Wave Soldering Defects


Flux Residues on a Printed Circuit Board

Flux residues visible on the board are more common due to the reduction in the use of cleaning in the industry. Over 75% of companies in Europe use no clean low residue materials. With the reliability of no clean being demonstrated in automotive products, the number of cleaning processes will continue to decline.

In Figure 1, the residues are either a result of the formulation of the flux or due to poor process conditions. Many no clean materials rely on the correct pre-heat temperature helping to minimize the residues left on the board. Wave contact time may also affect the residues left on the board. Discussion with the flux supplier should provide the correct process parameters.


Figure 1: The flux residues here could have been caused by the formulation of the flux or by poor process conditions
Figure 1: The flux residues here could have been caused by the formulation of the flux or by poor process conditions.

Celebrating 70 Years of Manufacturing Excellence
America's Oldest. A History of Innovation.

Over the past 70 years, the electronics manufacturing industry has changed dramatically as the industry continues to adapt to evolving demands and technology. Epec is at the forefront of innovation, with the expertise and agility to move at the speed of today’s businesses. At Epec, the customer comes first, and everything we do must be put through that filter. Whether it is developing e-commerce platforms to make it easier to work with us or creating a new product introduction (NPI) process that helps our customers get to market faster, we must focus on building the new. By doing that every day, and by always making the customer our top priority, we plan on being here for another 70 years and then some.

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Celebrating 70 Years - Epec Engineered Technologies