How many methods are there for lithium battery welding?

1, flash butt welding: Use the butt welding machine to make two sections of welded steel bar contact, after low voltage strong current, the steel bar is heated to a certain temperature and becomes soft, axial pressure top forging, forming the butt welding joint, the steel bar is lengthened along the axis. According to the butt welding process, flash butt welding is divided into continuous flash welding and flash - preheat - flash welding, the latter is used for welding large diameter steel bars. Prestressed steel bars are welded in this way.

2, arc welding: with the arc welding machine to produce a high temperature arc between the welding rod and the weldment, so that the welding rod and the arc within the range of condensation, solidification will form a joint or weld. The joint types of steel bar arc welding are: lap joint (single side weld or double side weld), bond joint (single side weld or double side weld), split joint (flat welding or vertical welding).

3, electroslag pressure welding: put a small piece of conductive agent (steel wire balls, welding rods, etc.) between the upper and lower welded steel bars, fill the pill box and fill the welding powder, use the AC welding machine to connect the circuit arc extinguishing, to form the slag pool, the steel bar condensation and stable arc for a certain time, at the same time, use the manual pressure mechanism to stop the pressure top forging, sweep the slag, bubbles, and form the joint. This kind of welding is often used for lengthening vertical bars in cast-in-place reinforced concrete structural members.

4, resistance spot welding: the upper and lower electrodes of the spot welding machine contact the interspersed steel bar and turn on the current, the contact point of the interspersed steel bar resistance is larger, the heat generated by the current will condense the steel bar, and the electrode pressure will weld the steel bar. Used for welding steel mesh, steel skeleton and other reinforcing bars interpenetration connection.

5, steel pressure welding: by a certain proportion of oxygen (purity ≥98.5%, bottled working pressure is less than 5 ~ 10 kg/cm 2) the flame will heat the end of the steel bar to the plastic state (temperature about 1320 ~ 1340℃), heating side pressure, and finally apply more than 3000 kg/cm 2 pressure, the steel bar is welded together.

The welding equipment has a heater (composed of a mixing pipe and nozzle), a pressurized oil pump (composed of an oil cylinder and a foot hydraulic pump) and a crimper (used to clamp, adjust the eccentricity and crimp the steel bar). The cutting machine should not be used when the steel bar is cut, so that the joint is horseshoe shape and cannot be crimped, and it should be cut with a toothless saw.

For welding the workpiece to be welded by the robot, the assembly quality and precision of the required workpiece must have a good divergence. Application welding robot should strictly control the preparation quality of parts and improve the assembly accuracy of weldparts. The surface quality of the parts, the size of the groove and the assembly accuracy will affect the weld tracking effect. It can improve the quality of parts preparation and the assembly accuracy of weldparts from the following aspects.

1. Prepare special welding process for welding robots, and stop strict process rules for parts size, weld groove and assembly size. The dimensional tolerance of common parts and bevelings is controlled within ± 0.8mm, the assembly dimensional error is controlled within ± 1.5mm, and the probability of welding defects such as porosity and edge biting can be greatly reduced.

2, the use of high precision welding fixture to improve the assembly accuracy of welding parts.

3, the weld should be cleaned and clean, no oil, rust, welding slag, slag and other debris. Otherwise, the interest rate will be affected. The position welding is changed from electrode welding to gas maintenance welding, and the spot welding part is stopped polishing to prevent the residual slag shell or porosity due to the position welding, so as to prevent the instability of the arc and even the splash.