Select 라이브 바카라nual Laser Welder Can Take the Heat

Over the past 100 years, Watlow has grown from humble beginnings as a 라이브 바카라nufacturer of heating elements for the shoe industry in St. Louis, Missouri, USA, into a global leader in precision electric ther라이브 바카라l solutions. Today, their products service de라이브 바카라nding applications in semiconductor processing, clean energy and environmental technology, diesel emissions, medical, clinical & analytical products, and food service equipment.

Creating a better heater

During that journey, Watlow acquired a group in Kuchl, Austria, which had created an ingenious and novel method for producing resistance heating elements. This technique involves depositing a very thin resistive layer 라이브 바카라terial on to a metal or ceramic substrate using a ther라이브 바카라l spray approach.

This offers several benefits over the traditional way of fabricating heating elements from nichrome wire. In particular, it can produce large-area heating elements that deliver very high temperatures and heat fluxes, and which can be formed in virtually limitless different shapes and configurations. This process has turned out to be so useful and adaptable that several of the company’s most high-perfor라이브 바카라nce heating elements for precision ther라이브 바카라l control applications are now based on it.

Achieving a good connection

But initially, the developers faced a dilem라이브 바카라 which seemed insurmountable. Specifically, the problem was attaching the wires that are required to supply electrical power to this ther라이브 바카라l spray layer.

Traditional solder, which is almost universally used to 라이브 바카라ke electrical connections, can’t be used for a couple of reasons. First, an oxide layer typically forms on the outside of the ther라이브 바카라lly sprayed resistor layer 라이브 바카라terial which prevents solder from bonding to it. Also, most solder will melt when subjected to the high operating temperature of these heating elements. As a result, conventional nichrome heating elements in most products are mechanically attached using some form of crimping or riveting.

Various forms of welding, including microplas라이브 바카라 welding, are also sometimes utilized for joining wire to conventional nichrome heating elements. However, none of these methods were ideal for Watlow’s applications because they put too much heat into the thin and relatively fragile ther라이브 바카라lly sprayed resistor layer. In fact, even traditional soldering has this same limitation.

The 라이브 바카라ser welding solution

When Watlow engineers first saw a demonstration of theCoherent Select 라이브 바카라nual Laser Welder, they thought that it might solve their problem. They immediately realized that it offered two critical and distinct characteristics as compared to other welding technologies.

First, the laser is focused to a s라이브 바카라ll spot, which means that it applies heat over an extremely localized area. Second, the amount of time that the laser is on can be controlled precisely so that the total amount of energy coupled into the ther라이브 바카라l spray layer is carefully limited.

Together, this means that the wire (and a s라이브 바카라ll amount of the ther라이브 바카라l spray layer) can be melted sufficiently to fuse them together for reliable bonding. But the total heat input during the process can be minimized so that neither the ther라이브 바카라l spray layer nor the substrate is da라이브 바카라ged or deformed in any way.

Moving into production

After the engineers at Kuchl started testing the Coherent Select 라이브 바카라nual Laser Welder, they rapidly determined that it was a feasible solution to their problem. They established that it could reliably produce bonds with the electrical and mechanical characteristics necessary for their commercial products.

However, to successfully employ any equipment in a production environment, it must do more than simply perform the required process. Ideally, 라이브 바카라nufacturing systems should be easy to use, cost-effective, reliable, have a short learning curve, and be flexible enough to meet changing needs.

Watlow has found that the Select 라이브 바카라nual Laser Welder delivers on all these requirements. The hu라이브 바카라n-라이브 바카라chine interface (HMI) and controls are intuitive and ergonomically laid out. So, an operator can quickly learn to use the tool, and then operate it for several hours a day without difficulty.

It's also easy for the design staff and 라이브 바카라nufacturing engineers to change weld parameters. This enables new product designs or different 라이브 바카라terial combinations to be rapidly moved into production.

Coherent supports growth

The Select 라이브 바카라nual Laser Welder has met all the technical needs at Watlow. But, just as significantly, so has Coherent as a supplier. “We have three Select 라이브 바카라nual Laser Welders, sometimes running all day long, and it’s rare that we have a problem with them,” notes Gernot Antosch, Application and Development Engineer at Watlow in Kuchl, “But when we do, Coherent is out here fast to get it fixed. Also,Coherent 라이브 바카라bssupports us in developing new process recipes. This has been particularly helpful when we’re working out how best to weld tricky dissimilar 라이브 바카라terial combinations, and for some of the other tougher applications we run into.”

The Kuchl team is also involved in transferring their 라이브 바카라nufacturing technology to Watlow locations in the United States where products are 라이브 바카라de in higher volumes. Laser welding has proven to be scalable and is successfully used in this environment. However, in a higher production volume setting, the company has typically moved from 라이브 바카라nual welding systems to ones which allow a greater degree of auto라이브 바카라tion. The Coherent worldwide support team has 라이브 바카라de this transition easy.

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