ELETTROLASER MS 3.5, End-User And Maintenance Manual

Page: 61 / 108

code: UMS012 review: 0.2 date: 20/04/2022
Laser Welding machine - MS 3.5
user and maintenance manual page 61 of 102
7.3.5 Microscope shutter
This device consists of a liquid crystal (LCD) filter that, when subjected to a specific tension, turns completely dark. It is located
between the 45° mirror and the focus lens of the microscope.
The shutter interrupts the operator’s visual path through the microscope in the moment in which the laser shot melts the
workpiece.
The function of this device is to stop the operator from being dazzled by the visible radiation flash of light generated by the weld
pool.
This protection prevents anomalous diffusion of laser radiation towards the operator’s eyes.
The normal condition of the device is when the microscope shutter is closed, thus allowing for use of the microscope in any given
moment.
Once the laser emission is enabled (resonator shutter open), the operating logic of the microscope shutter is the following:
•
Pressure on the control pedal;
•
The microprocessor detects the closure of the pedal contact and commands the microscope shutter to close;
•
The microprocessor enables activation of the laser lamp;
•
The status of the microscope shutter is ON as long as the laser lamp is activated, plus a reasonable time frame to allow the weld
pool to cool down and lose its luminosity;
•
Return to standby status, with detection of full opening of the microscope shutter
.
7.3.6 Microscope infrared filter
The infrared filter is an optical glass, opaque at a laser radiation level of 1064 nm, which impedes passage in any direction of the laser
radiation in use; it is located within the optical tube.
It appears light grey and perfectly transparent.
The function of this filter is to protect the operator’s eyes fr om stray laser radiations in the optic path of the microscope, even if
these are highly improbable in this area
.
7.3.7 Welding chamber infrared filter
The welding chamber infrared filter is an optical glass, which becomes frosted at a laser radiation level of 1064 nm, which constitutes
the inspection window of the welding chamber (Fig. 7-3).
This filter is light grey and perfectly transparent.
The filter is easy to replace
.
7.3.8 Guards
Guards are parts of a machine used specifically to provide protection via the presence of a physical barrier. Based on their build,
guards can be called headset, lid, door, total segregation guard, etc.
Guards can operate autonomously and are only functional when closed or associated with an interlock device, which may or may not
feature a system for blocking of the guard; when it does, protection is guaranteed regardless of the position of the guard.
Please find below a description of the types of guard used on this machine (Fig. 7-16 and Fig. 7-17):
•
Fixed guard – this guard is held in position (i.e. closed) either permanently (via welding, etc.) or with fastening elements (screws,
nuts, etc.), which make it impossible to remove/open without using tools;
•
Flexible shield – Closes access to the welding chamber. Allows for introduction of the workpieces, limits the emission of diffuse
or reflected radiation and prevents any inert shield gas leaks from the welding chamber (if used during the welding stages), thus
effectively protecting the metals from oxidation
.