1. Select the current according to the welding material. Welding thin plates requires less current, while welding thick plates requires more current.

2. Select the current according to the welding position. Welding corners and edges requires a large current, while welding flat parts requires a small current.

First, gas shielded welding

Gas shielded welding refers to the welding method with carbon dioxide or argon protection and without covered electrode welding wire. CO2 welding efficiency is high, and argon arc welding mainly welds aluminum, titanium, stainless steel and other materials. Submerged arc welding is welding with welding wire and flux protection. Flux buried the arc like sand. Mainly used for welding thick plates. The harm of gas shielded welding is that arc and dust have great influence on the health of welders.

Second, the operation method of gas shielded welding

1, equipment preparation

First of all, the equipment should be inspected and prepared. Fix the electrode on the gas shielded electrode holder and adjust the length and angle of the electrode. Select the appropriate welding voltage and current, and open the gas tank valve.

Step 2 Prepare for work

Clean the surface of the workpiece to be welded, remove impurities such as oil stain and scale, and ensure good contact.

3. Start welding

Place the gas shielded electrode holder near the surface of the workpiece, and press the current switch to start arc striking. At the same time, press the handle of the spray gun to generate infrared radiation belt at the front end of the nozzle and heat the surface of the workpiece. After heating to a sufficient temperature, put down the handle and automatically stop spraying the heat source.

4. End welding

After welding, press the current switch to stop the arc. After the molten pool is cooled, the weld is preliminarily polished and reshaped. The above is the basic operation method of gas shielded welding, and attention should be paid to closing the nozzle and handling it in time when arcing. Before using gas shielded welding, you must be familiar with the operating instructions of the equipment and wear corresponding protective equipment to ensure personal safety.

5, shall not be stained with grease

When using the welding torch, you must first check the suction performance and air tightness, and the connecting parts, air passages and regulating valves of the welding torch must not be stained with grease.

Step 6 stay away from the fire

When the welding torch is ignited, the acetylene valve should be opened first, and then the oxygen valve should be opened to adjust the flame; When turning off the fire, acetylene should be turned off first, then oxygen. When stopping use, it is forbidden to permanently connect the welding torch, hose and air source.