(1) The heat input can be reduced to a lower demand, the metallographic change range of the heat affected zone is small, and the deformation caused by heat conduction is also low;
(2) The welding process parameters of 32mm plate thickness single-pass welding have been verified and qualified, which can reduce the time required for thick plate welding and even save the use of filler metal;
(3) There is no need to use electrodes, and there is no concern of electrode contamination or damage. And because it is not a contact welding process, the wear and deformation of the equipment can be reduced to a lower level;
(4) The laser beam is easy to focus, align and be guided by optical instruments. It can be placed at an appropriate distance from the workpiece, and can be re-guided between tools or obstacles around the workpiece. Other welding methods are limited by the above space. and unable to perform;
(5) The workpiece can be placed in a closed space (evacuated or the internal gas environment is under control);
(6) The laser beam can be focused in a small area, and small and closely spaced parts can be welded;
(7) A wide range of weldable materials can be used, and various dissimilar materials can be joined to each other;
(8) It is easy to perform high-speed welding by automation, and it can also be controlled by digital or computer;
(9) When welding thin or thin wire, it will not be troubled by melting back like arc welding;
(10) It is not affected by the magnetic field (arc welding and electron beam welding are easy), and can accurately align the weldment;
(11) Two metals with different physical properties (such as different resistances) can be welded;
(12) No vacuum or X-ray protection is required;
(13) If perforated welding is used, the depth-to-width ratio of the weld bead can reach 10:1;
(14) The device can be switched to deliver the laser beam to multiple workstations.
Laser welding features:
It belongs to fusion welding, which uses the laser beam as the energy source to impact on the joint of the weldment.
The laser beam can be guided by a flat optical element, such as a mirror, and then projected onto the weld seam by a reflective focusing element or mirror.
Laser welding is non-contact welding, no pressure is required during the operation, but inert gas is required to prevent oxidation of the molten pool, and filler metal is occasionally used.
Laser welding can be combined with MIG welding to form laser MIG composite welding to achieve large penetration welding, and the heat input is greatly reduced compared to MIG welding.
