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（3）Gently pinch the side edge of the lens with the thumb and index finger of
the left hand. (Note that the finger cot cannot touch the surface of the lens
to avoid leaving traces);
（4）With the lens facing both eyes, hold the polyester cotton swab in your
right hand, gently wipe the lens from bottom to top or from left to right in a
single direction (do not wipe back and forth to avoid secondary pollution of
the lens), and use rubber air blower (clean compressed air) blows the surface
of the lens. Both sides should be cleaned. After cleaning, reconfirm that
there are no residues of the following: detergent, floating dust, foreign
matter, and impurities.
Removal and installation of lens
The entire process must be completed in a clean place, and dust-proof
gloves or finger cots must be worn when removing and installing the lenses.
■ Disassembly and assembly of the lower protective glass:
Protective glass is a vulnerable part and needs to be replaced after
damaged.
（1）As shown in Figure 10, pinch both sides of the drawer-type glass
holder and slowly pull out the protective glass drawer;
（2）Rotate the protective glass cover 90° to remove the protective glass
cover; take out the protective glass;
（3）Clean the lens, protective lens drawer and sealing ring. If the
sealing ring is damaged, replace it with a new one;
（4）Install the cleaned (or replaced) lens (regardless of the front and
back) to the protective glass drawer;
（5）Reinstall the protective glass cover;
（6）Reinsert the protective glass holder back into the welding head.
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