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Coated Welding Electrode: Iron Wire Dipped in Chalk and Water Glass (Kjellberg, 1907)
In 1907 Oscar Kjellberg patented a welding electrode made by dipping bare iron wire in a thick mixture of carbonates and silicates. In the arc the coating gives off a fume that keeps air away from the molten metal while it cools. Here the carbonate is chalk and the silicate is water glass. Cut the wire to length, dip it in the paste, and dry the rods well before use.
The picture: our diagram of the wire, the dip and the coated rod.
初学者
An hour, then drying overnight
说明
1
1
Cut the wire
Cut the wire
Cut straight iron wire about 3 mm thick into 350 mm lengths and wipe it clean.
此步骤所需材料：
铁丝7 m所需工具：
斜口钳
台虎钳
卷尺2
2
Mix the coating
Mix the coating
Stir sifted chalk into water glass, a little at a time, until the paste is thick enough to cling to the wire.
此步骤所需材料：
水玻璃（硅酸钠溶液）300 克
碳酸钙（白垩粉）400 克所需工具：
搅拌盆套装
数字厨房秤
橡胶手套3
3
Dip the rods
Dip the rods
Pour the paste into a tall jar. Dip each rod, leaving the top 30 mm bare for the holder, and lift it out slowly. When the first coat has set, dip again for a thicker coat.
所需工具：
玻璃罐橡胶手套4
4
Dry
Dry
Hang the rods bare end up until the coating is hard, then dry them in a warm oven before welding. Keep them dry.
所需工具：
晾干架
烤箱5
5
Wire for a batch
Wire for a batch
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