How to Weld Uncovered Paper Towel Frame
In the paper towel holder electrode welding, the arc length depends on the human hand: when you change the gap between the electrode and the workpiece, you also change the arc length. In most cases, direct current is used for welding, and the electrode is used as both the arc carrier and the filling material for the weld. The electrode consists of alloy or non-alloy metal core wires and electrode coating. The coating protects the weld from air and stabilizes the arc together. It also causes the formation of slag layer and protects the weld to make it shape.
Key points and precautions for flux-cored wire welding of paper towel frame:
1. Select the horizontal characteristic welding power source and the reverse polarity when DC welding. The general CO2 welding machine can be used for welding, but the pressure of wire feeding wheel should be adjusted slightly.
2. The distance between welding nozzle and workpiece should be 15-25 mm.
3. The protective gas is generally carbon dioxide, and the gas flow rate is 20-25L/min.
4. Dry elongation length: the general welding current is about 15 mm below 250A, and 20-25 mm above 250A is more suitable.
Welding method of paper towel frame: 1. Welding method, polishing the pad and pins of components with fine sandpaper and coating flux. The solder head is dipped with a proper amount of solder and contacts the solder joint. After the solder on the solder joint melts completely and immerses the lead of the component, the solder head quietly lifts up along the pin of the component and leaves the solder joint.
2. Flux, 25% rosin dissolved in 75% alcohol (component ratio) as flux.
3. Choosing suitable soldering tin, low melting point soldering wire for welding electronic components should be selected.
4. Tin should be applied before electric soldering iron is used. The specific method is to heat the electric soldering iron and apply flux to the soldering iron head when it can melt the soldering tin just now, then apply soldering tin evenly to the soldering iron head, so that the soldering iron head can eat a layer of tin evenly.