Gravity covered electrode can be a semi-mechanized welding covered electrode supported by gravity. It has the characteristics of simple equipment, convenient operation, low labor intensity and high deposition efficiency. There are two types of gravity covered electrode: iron powder type and non-iron powder type. The covered electrode of this coating is generally long (generally 500-900mm) and the outer diameter is relatively thick, so the deposition efficiency is high.
Gravity covered electrode arc ignition is easy. After the covered electrode of the coating is melted, it can form a casing with an appropriate length, which ensures that the arc can burn stably in the casing when the covered electrode end of the coating is stuck to the steel plate.
The gravity covered electrode length of extended data is longer than that of ordinary manual arc welding covered electrode, which is generally more than 500mm. In order to realize automatic arc ignition, arc ignition agent is usually coated on the end of coated electrode. In 1938, Danish K.K.Madse first put forward a welding method which uses thick coating covered electrode and automatically transports covered electrode by strip gravity.
The covered electrode clamp is installed on a bracket which can slide along the inclined track, and the bracket is arranged along the center line of the weld. Before arcing, under the action of the weight of the coated electrode clamp and the self-weight of the coated electrode, the thick coated electrode keeps in contact with the workpiece.
After the arc is ignited, the covered electrode keeps falling by its own weight and is sent into the arc until it is melted to a length shorter than a certain length. Then, the bracket and the coated electrode clip automatically pop out of the coated electrode head, and the arc is extinguished.
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