Take a Peek Inside the New LM-D Series of Welders

Sisma’s new LM-D Series laser welders represent a major step forward in jewelry welding technology. Building on the proven success of previous LM-D models, used by thousands of jewelers worldwide, the new series refines every detail for greater comfort, control, and consistency. From improved ergonomics to enhanced laser performance, every upgrade is designed with jewelers in mind.

Expanded Range of Models

The new generation of Sisma laser welders introduce more power and configuration choices than ever before, all built into a refined ergonomic design. With Sisma's versatile configuration options, each model can be tailored to accommodate different operators, processes, and workshop environments.

Create your perfect setup!

  • Four power options—190, 230, 260, 300 joules
  • 24 model variations and over 20 available accessories
LM-D Ready
  • 190 or 230 Joules
  • Flex Access
  • OEM Stereo 10X Microscope
  • 7" Touchscreen Display
LM-D Ready Lynx
  • 230 Joules
  • Flex Access
  • Lynx Dynascope
  • 7" Touchscreen Display
LM-D
  • 230 or 260 Joules
  • Door with Arm Holes
  • 10X Leica Stereo Microscope
  • 10" Touchscreen Display
LM-D Flex
  • 230 or 260 Joules
  • Flex Access
  • 10X Leica Stereo Microscope
  • 10" Touchscreen Display
LM-D Open
  • 230 or 260 Joules
  • Fully Open Access
  • 10X Leica Stereo Microscope
  • 10" Touchscreen Display
  • Nanospot Included
LM-D Lynx
  • 230 Joules
  • Flex Access
  • Lynx Dynascope
  • 10" Touchscreen Display
LM-DT
  • 230 or 260 Joules
  • Door with Arm Holes
  • 10X Leica Stereo Microscope
  • 10" Touchscreen Display
  • Integrated Camera
  • Built-in DisplayPort for TV/monitor connection
  • Nanospot Available
LM-DT Flex
  • 230 or 260 Joules
  • Flex Access
  • 10X Leica Stereo Microscope
  • 10" Touchscreen Display
  • Integrated Camera
  • Built-in DisplayPort for TV/monitor connection
  • Nanospot Available
LM
  • 300 Joules
  • Flex Access
  • 10X Leica Stereo Microscope
  • 10" Touchscreen Display
  • Welder Stand, Nanospot, and Powerboost Included
LM-T
  • 300 Joules
  • Flex Access
  • 10X Leica Stereo Microscope
  • 10" Touchscreen Display
  • Integrated Camera
  • Built-in DisplayPort for TV/monitor connection
  • Welder Stand, Nanospot, and Powerboost Included
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What Makes the New Sisma LM-D a More Powerful Laser Welder?

At the heart of every LM-D model is a new solid-machined resonator, providing exceptional beam stability and alignment over time. Combined with updated internal optics and electronics, the LM-D achieves more efficient energy transfer—delivering the same power output while consuming 20% less electrical energy than before.

Intuitive Control and Connectivity

Sisma redesigned the interface to simplify every aspect of setup and operation. Together, these improvements make the LM-D Series both more approachable for new users and more efficient for experienced operators.

  • Expanded Work Chamber has a wider opening and larger workspace for improved accessibility and visibility.
  • Ergonomics enhancements include adjustable armrests, optional headrests, and a spacious chamber ensure comfort and reduced strain for all operators.
  • 10” High-Definition Display: Brighter, larger, and easier to read (7” on LM-D Ready).
  • Improved User Interface: Simplified, ergonomic controls with key parameters always visible for quick, confident operation.
  • Wi-Fi enables remote diagnostics, software updates, and online support directly from Gesswein or Sisma.

Image: Welder with optional extendable microscope mount (Ergokit)

Built to Last—and Easy to Maintain

Sisma welders have always been known for their reliability, and the new LM-D Series takes it further.

The housing now includes a sliding service door and simplified internal layout for quick cleaning and targeted maintenance. A closed dust-proof structure protects optical components for long-term stability, while an optional Eco-Mode saves power when idle.

LM-D welders are inexpensive to maintain and come with the longest lasting flash lamp in the industry. Each system is also covered by a three-year warranty when purchased through Gesswein.

Where Power Meets Precision

New beam enhancements improve energy efficiency, accuracy, and weld quality for every application.

  • Next-Generation Resonator: The new solid-aluminum, single-block resonator provides superior mirror stability and performance, setting a global first for jewelry welders.
  • Improved Power Efficiency delivers the same laser strength with less energy consumption
  • Nanospot upgrade gives pinpoint accuracy with welds as small as 0.05 mm—ideal for micro-repairs and delicate assembly
  • Power Boost delivers short bursts of high energy for demanding applications and heavy materials. (LM/LM-T 300 only)
  • Velvet Spot Technology enhances weld focus and depth, improving
    accuracy and welding quality across complex joints. (LM/LM-T 300 only)

Designed with Customer Feedback

The LM-D Series wasn’t built in isolation—it was shaped through continuous dialogue with professional users. Sisma engineers listened to feedback from bench jewelers, repair specialists, and manufacturers, resulting in a welder that feels more intuitive, efficient, and enjoyable to use during long work sessions. The result? A welder that truly adapts to the jeweler—not the other way around.

Why Do These Upgrades Matter?

The improvements in the LM-D Laser Welder Models go beyond comfort and aesthetics - they translate directly to better welds, faster turnaround, and less downtime. In short, Sisma’s LM-D Series helps jewelers work smarter, cleaner, and with more confidence, whether handling delicate chain repairs or complex platinum fabrication tasks.

  • Welding Performance Upgrades

    Smarter power delivery and improved control for consistent, high-quality welds.

    • Improved Power Efficiency
    • Consistent Weld Quality
    • Updated User Interface
    • Larger HD Control Monitor

  • Design & User Experience

    Better comfort, easier access, and reduced downtime through thoughtful engineering.

    • Expanded Work Chamber
    • Simplified Maintenance
    • Enhanced Ergonomics
    • Remote Diagnostics

  • Advanced Laser Features

    New solid resonator design (housing for flash lamp and mirrors) provides unbeatable stability and performance.

    • Smart Spot Technology
    • Nano Spot Capability (0.05 mm)
    • Power Boost and Velvet Spot Option
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