What are the laser welding benefits
Laser Welding Benefits
(1) The required amount of heat input can be reduced to the minimum, and the range of metallographic change in the heat-affected zone is small, and the deformation caused by heat conduction is also the lowest;
(2) The welding process parameters of 32mm plate thickness single-pass welding have been verified to be qualified, which can reduce the time required for thick plate welding and even save the use of filler metal;
(3) No need to use the electrode, no electrode pollution or damage concerns. And because it does not belong to the contact welding process, the loss and deformation of the machine and tools can be reduced to the minimum;
(4) the laser beam is easy to focus, alignment and guided by optical instruments, can be placed in the appropriate distance from the workpiece, and can be guided between the tools or obstacles around the workpiece, other welding rules due to the above space restrictions and can not play;
(5) The workpiece can be placed in a closed space (under the control of vacuum pumping or internal gas environment);
(6) the laser beam can be focused in a very small area and can weld small and close spaced parts;
(7) wide range of weldable materials, can also be engaged with each other a variety of heterogeneous materials;
(8) Easy to automate high-speed welding, can also be controlled by digital or computer;
(9) when welding thin or fine diameter wire, it will not be as easy as arc welding to have the trouble of backmelting;
(10) not affected by the magnetic field (arc welding and electron beam welding are easy), can accurately align the welding parts;
(11) Two kinds of metals with different physical properties (such as different resistance) can be welded;
(12) No vacuum or X-ray protection is required;
(13) if the perforated welding, the welding bead depth to width ratio can reach 10:1;
(14) the device can be switched to transmit the laser beam to a number of workstations.
Laser welding Disadvantages
(1) the welding position must be very accurate, must be in the laser beam focus range;
(2) when the welding parts need to use the clamping fixture, it is necessary to ensure that the final position of the welding parts and the laser beam will impact the welding joint alignment;
(3) The workpiece whose maximum weldable thickness is limited and whose penetration thickness is far more than 19mm is not suitable for laser welding on the production line;
(4) high reflectivity and high thermal conductivity of materials such as aluminum, copper and its alloys, the weldability will be changed by laser;
(5) When conducting laser beam welding of medium to high energy, the plasma controller shall be used to remove ionized gas around the molten pool to ensure the reappearance of the weld pass;
(6) the energy conversion efficiency is too low, usually less than 10%;
(7) rapid solidification of weld pass may lead to concerns of porosity and embrittlement;
(8) The equipment is expensive.
