1. three different uses:

1, the use of electrode: in the narrow or poor ventilation conditions of the occasion, should choose acid electrode or low dust electrode. For structures with large welding workload, high-efficiency electrodes, such as iron powder electrodes, high-efficiency gravity electrodes, etc., or special electrodes such as vertical downward electrodes of bottom electrodes, should be used when conditions permit, so as to improve welding productivity.

2. Use of welding wire: It is mainly used for repairing some heat-resistant parts. When welding, the temperature is generally controlled at about 40 degrees Celsius, and the wall thickness is 0.4-0.5mm, and the maximum is not higher than 100 degrees Celsius.

3, the use of welding piece: mainly used for gas flame, high frequency, resistance, furnace medium brazing method, brazing copper, copper alloy and steel, cast iron, hard alloy, etc.

II. The overview of the three is different:

1. Overview of welding rod: The metal strip that melts and fills the joint of the welding workpiece during welding or electric welding. The material of the electrode is usually the same as the material of the workpiece.

2. Overview of welding wire: welding wire is used as filler metal or at the same time as conductive wire welding material.

3. Overview of solder pieces: There are phosphor copper, oxygen-free copper and copper solder (welding wire, welding rod and welding ring) without silver welding wire with special strength requirements.

3. three different materials:

1. Material of welding rod: welding rod is a melting electrode coated with drug skin for arc welding, which is composed of two parts: drug skin and welding core.

2. Material of welding wire: in gas welding and tungsten gas shielded arc welding, the welding wire is used as filler metal; in submerged arc welding, electroslag welding and other metal gas shielded arc welding, the welding wire is both filler metal and conductive electrode. The surface of the welding wire is not coated with anti-oxidation flux.

3. Material of solder piece: belongs to copper-zinc alloy solder.