Use&Precautions: -Flat nozzle can't be used on this welder. -We have put the exchange of the heating core image on our listing. -We suggest the pipe and the black wire can be trapped together for much convenient working. -After the electric wire is broken, you can take the gun shell connection screw, remove the gun core, with the same specifications of the gun can be replaced. -Welding torch with the complete light to light, so as not to break the gun part of the refractory porcelain material, leaving the electric wire short circuit. -For the first time, there may be spitfire or smoke. This is a normal phenomenon, power will automatically disappear after 5 minutes.When the torch, please adjust the temperature to the lowest, until the barrel can be cooled before cooling, so as not to waste heat damage machine Pieces, affecting the service life.