Branson GMX-20MA Ultrasonic Spot Welder

July 13, 2021
Emerson's spot welder ensures high precision for welding of battery foils and tabs, wire terminations, and connectors

The Branson GMX-20MA ultrasonic metal spot welder bonds nonferrous metals including bus bars, foils, switches, and wire terminations in automotive electrical systems, electric vehicles, batteries and battery packs, power storage systems, and related applications.


The spot welder is built around a rigid pneumatic actuator with dual linear bearings and a digital load cell to ensure smoother vertical motion and more precise downforce control for maximum weld quality and repeatability. Actuator travel and tool positioning relative to the welded parts are tracked and measured using a linear encoder. Once tooling/part contact is made, a digital load cell measures and maintains a precise level of actuator downforce on the parts, ensuring that weld energy is accurately delivered and consistent weld quality is assured from one weld to the next.


The programmable controls enable operators to manage the welding process in multiple modes: time, energy, peak power, and distance. These weld modes together with the digital controls ensure the added precision required to maintain tight weld process control despite occasional variations in part surface quality or cleanliness. In most cases, the high-frequency, lateral scrubbing action of the ultrasonic tooling eliminates the need to pre-clean parts.


The GMX-20MA is programmed through a user-friendly, touchscreen HMI housed in the unit’s Branson 2000Xd power supply/controller. The touchscreen makes creating, editing, and recalling stored production recipes fast and simple. It also opens up access to the unit’s multiple welding control modes and enables users to configure production and quality-monitoring solutions.


Throughout the production process, the GMX-20MA power supply/controller continuously compiles and stores extensive weld quality and traceability data. It also conducts amplitude stepping for optimization of weld strength and appearance, with built-in cycle counters to track production. Total cycle time can be displayed in the weld results screen, which allows the user to monitor key operating parameters. The unit’s Visual Quality Screen (VQS) monitors and displays real-time quality data so that even small variations can be identified and corrected immediately.

  • Dual linear bearings ensure a smooth, precise welding process.
  • Nodal support design precisely balances the Horn and Anvil during the welding process. This ensures effective transfer of Ultrasonic energy for improved weld quality and consistency.
  • Precise linear encoder enables precise height and distance control during welding to ensure welding accuracy.
  • Increased weld modes options make it applicable for a wider range of welding applications.
  • Upgraded control & power supply provides multiple real-time welding data and quality monitoring.
  • Pressure trigger mechanism & load cell ensure accurate welding control & welding quality.
Overall Dimension (Actuator) (L x W x H)16.7 x 13 x 29.5 (425 x 329 x 750 mm)Gross Weight 198 lb. (90 kg)Working Voltage220V (4 KW), 3 phase 380V (5.5 KW)Air Supply Requirementminimum 0.6Mpa, 87 psiMaximum Stroke 2 in. (50 mm)Valid Stroke0.43 to 1.77 in. (11 to 45 mm)