1. The length of the welding arc is preferably 2 to 4 mm when welding ordinary steel, and 1 to 3 mm when welding stainless steel. If it is too long, the protection effect will be poor. In order to prevent the occurrence of welding pores, any rust, oil stains, etc. on the welding part must be cleaned.
2. When welding box-type houses, a power supply with vertical external characteristics should be used, and positive polarity should be used for DC (the welding wire is connected to the negative pole). It is necessary to ensure that the weld seam has beautiful features after being formed, and the welding deformation is small.
3. It is best to use argon gas with a purity of 99.99% as the protective gas to cooperate with the welding work of the box house. When the welding current is 50-150A, the argon gas flow rate is 8-10L/min. When the current is 150 When ~250A, the argon flow rate is 12~15L/min.