https://www.youtube.com/watchv=_MRUqlxYtk8    Description:    This microcomputer intermediate frequency spot welding machine is designed according to the general maintenance of the general conventional steel-shell lithium battery industry and the special needs of on-site production. Uses the latest microcomputer control board to control the current and discharge time accurately. The performance is more stable and more reliable. It can be used to welding nickel-clad steel plate within 0.25mm, pure nickel sheet within 0.15mm. You can have a try.    Features:  Adopts latest microcomputer control board to control the current and discharge time accurately.   Made of quality material, with high hardness, fine wear resistance, anti-broken and practical.  Equipped with multiple functions, prefect for welding battery.  Welding n-eedles detachable design, comes with 4 neddles, you can detach and change it easily.  Easy to rotate the rotation knob to adjust time and current percentage, 40-100% current adjustable, 0-100% time adjustable(640-1600A current, 20ms-1s time.)  The power line and the foot switch line are adopt screw free quick connection terminal, more convenient and reliable.  Welding object: it can be used to welding nickel-clad steel plate within 0.25mm, pure nickel sheet within 0.15mm.    Note:  The spot welding machine cannot weld copper and aluminum materials.   Don't press too hard when welding, the harder you are, the weaker the welding will be, just moderate strength.  Do not use the battery for the first welding attempt. You can find a clean, non-destructive and distortion-free iron plate or steel plate, and put the nickel sheet on the iron plate, the current is 80 to 100, and the time is 0, you can test the machine    Using steps:  Firstly, check the electrode and welding-needle of the machine, and the two electrodes can not contact each other. (if contact accidentally, don't worry, it will not damage the machine)  Secondly, turn on the power switch, the power light will light up, and the machine will be entered into standby state, standby power consumption is 2W.  Then, after entering the power-on state, adjust the current and time parameters according to the thickness of the weldment. The current is generally adjust to 80-100, and time is generally adjust to 0-10.  The power situation is different in different regions, and the actual operation is generally adjusted from low to high, and welding firmly  Finally, place the nickel sheet flat against the battery, press the two soldering pens on the nickel sheet, adjust the current and time, step on the foot pedal and the work light flashes to complete the welding    Parameter analysis:  Current: refers to the size of the welding output power, the value is converted, the minimum output.  Time: refers to the length of the energization time during the welding process, numerical simulation, the longer the energization time.