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Technical articles and news in the world of evaporation

Laser Welding is the Standard


Rosenblad Design Group, Inc. was the first to introduce laser welded evaporator plates to the Pulp and Paper industry back in 1994. This innovation brought major opportunities to the market in both design enhancements and product durability. The technology of laser welded heat transfer surfaces has proven to be the preferred choice for heat exchangers for more than 25 years. The consistent quality and flexible design characteristics of laser welding have remained unmatched by any other technology on the market today.


Engineering without restraint

All our laser welded plates are processed using fully automated CNC machinery that uses logic derived directly from our CAD designs. This freedom to design our plates specifically for the applications they serve, allows us the ability to optimize the thermodynamic functions both internally and externally. Our manufacturing capabilities also allow us the ability to produce plates up to 5ft wide and 40ft long, the ability to produce extra-large plates bring benefits in both overall foot print requirements and equipment costs.

Precision through CNC laser welding

The precision robotic movements with laser welding results in exact placement of every feature in our plate designs. Most importantly, each plate is built within extremely tight tolerances of the next. This consistency is critical as all plates will be assembed with a common header system. Any variations in plate design could result in flow balance issues among the plates.

“Laser focused” Quality

Laser welding is one of the most precise methods of welding on the market, making it the preferred method for heat exchangers. As in all welding applications, post weld quality is a product of  base metal preparation, joint fit-up, heat input, weld speed, and adequate gas purge. The effects of these conditions are only intensified in autogenous welding methods, where no filler material is added to the weld joint. This is an area where laser welding clearly outperforms other welding methods, as CNC laser welding offers the most consistent weld uniformity and lowest heat input conditions available.

Heat input during welding can be one of the most critical conditions in a welding process, as excessive heat will alter the metallurgic properties of a metal in both the weld matter and the heat effected zones in the base metal. These changes in the weld material can greatly reduce the life of a heat exchanger by lessening the product’s defense against physical strain and corrosive attach. The extremely defined weld structure of laser welding minimizes the total heat input, preserving the material’s original protective properties.

– Have more questions about laser welding? Contact us, we are happy to assist you!