Excuse me, about the electric shock problem of arc welding, I am very puzzled

Touching the workpiece by hand will not be electrocuted because you have not touched the two stages of the output of the welding machine at the same time, standing on the ground and touching the copper sheet will not be electrocuted because your shoes are dry, the voltage added to the human body is very small, there will be no electric shock, if the ground and shoes are relatively wet, it will be electrocuted. 120A refers to the maximum output current of the welding machine, not the current through the human body.

36V will also have an electric shock feeling when the human body is relatively wet, and the electric shock will be fatal for a long time, but it is relatively easy to get rid of, and it is not absolutely safe.

It is best to wear welding gloves when changing welding rods, as the surrounding environment will conduct electricity. Welders are high-risk jobs, so pay attention to safety.

The cause of electrocution death is that when the current passing through the human body exceeds the safe value that the person can tolerate, the lungs will stop breathing, and the myocardium will lose the function of contracting and beating, resulting in ventricular fibrillation of the heart, the "blood pump" will not work, and the blood circulation of the whole body will stop. After the cessation of blood circulation, it causes a lack of oxygen to the cellular tissues, and within 10 to 15 seconds, the person loses consciousness; After a few minutes, the person's nerve cells begin to paralyze and die.

According to your description, it should be a single-phase electric shock. Single-phase electric shock refers to an electric shock accident in which a part of the human body touches a one-phase charged body on the ground or other grounding conductors. For high voltage, although the human body is not touched, but because it exceeds the safety distance, high voltage produces an arc on the human body, which also belongs to single-phase electric shock, and the danger degree of single-phase electric shock is related to the operation mode of the power grid.

1.All you see when welding is welding slag, and the molten iron is underneath the slag.

3.Flat and vertical welding are all 45 degrees, just one goes along and one goes backwards.

4.When the middle plate is docked, go semi-circle, the thick plate small cut goes back and forth, the thick plate big cut goes the figure-eight, the thin plate butt goes to the crescent, and the vertical welding draws a circle.

5.Squat with your knees together and your knees between your crutches.

6.Under normal circumstances, when the incoming line voltage of the welding machine is 220V and when the thin plate is welded with a small current, the welding rod used is used under normal circumstances, and the welding rod with a large cut of the thick plate is more than 4mm.

7.As long as the process is right, the fish scale pattern can be welded. The placement of the welded aesthetic root workpiece is also related. The weld of the workpiece burned obliquely is very thin.

8.The length of the arc has a great impact on the quality. If the workpiece is long, it can't be burned through, and if it's short, it can't arc.

9.After welding, knock off the skin and pile it up like, the current is too small, and the welding edge has a bite phenomenon, which is too current.

First of all, don't drink alcohol to learn welding, because people who drink alcohol can't hold their hands steady. Welding must be peaceful, practice more and learn more.

2.What is the range of the melt pool temperature to prevent it from being welded through? How to judge by eye ?

The temperature control of the molten pool mainly depends on the material, and the temperature is different for different materials, so if you judge by your eyes, you need to have a certain amount of practical experience and accumulate in the experience.

I don't know what kind of handover method you want to ask, is it gas welding or sub-arc welding?

1: It is very simple to distinguish between molten iron and slag, the first element is that the current cannot be small, and the current is small, and the arc blowing force is small, and the slag is easy to advance. The second is that the angle of the electrode should be oblique.

Tilt it so that the melt pool can be half covered and half covered, and the protection effect is the best. This applies to flat welding and the like, but this is not the case for vertical welding and vertical welding.

Let's make this clear! When the melt pool is about to burn through, the molten pool will sink a little, and the arc sound will become low. If you don't want to be welded through, reduce the current.

Speed up welding, but only if you guarantee penetration and penetration!

3: The angle of flat welding electrode is preferably 80-90°. I usually use 90° because of the high penetration depth, but it is easier to weld through. Vertical welding should be perpendicular to the angle of the plate, otherwise the molten iron will flow downward, resulting in welding nodules.

Remember 8 words, steady hands, even breath, sharp eyes, and ears!

Multi-soldering is just fine!

The architecture bookstore has books on manual arc welding techniques, so buy one and see if they are all there.

More hands-on practice to become a great good welder requires practice to improve your skills.

It's not something that can be practiced just by talking.

Summary. Hello pro, common faults of AC welding machine and its troubleshooting methods, fault phenomenon 1; The size of the welding current. Cause of failure:

The welded cable is too long; The welded cable is coiled into a disc shape to form an excessive inductance, and the contact between the welded cable and the binding post is poor. Exclusion method: reduce the length of the cable or increase the area of the cable core; Straighten the end of the cable so that it is not bent; Make good contact between the electrical grade wire and the binding post.

Hello pro, common faults of AC welding machine and its troubleshooting methods, fault phenomenon 1; The size of the welding current is resistant. Cause of failure: The welded cable is too long; The first coil of the welded cable is formed into a disc shape, and the inductance is too large, and the contact between the welded cable and the binding post is poor.

Exclusion method: reduce the length of the cable or increase the area of the cable core; Straighten the end of the cable so that it is not bent; Make the electrical grade wire in good contact with the binding post.

Here's the relevant information for you to take a look ha

Loosening of the brake screws or springs of the movable core; The moving mechanism of the iron core is damaged. Parallel elimination method: tighten the brake screw or adjust the tension of the bullet when it is buried; Fix the iron:

The mechanism of the migrating ants. Fault phenomenon 4: During the welding process, the current fluctuates from one to the other.

To put it simply, the common welding defects of arc welding are: porosity, cracks (cold cracks and hot cracks), non-fusion, non-penetration, slag inclusion, arc pits, undercuts, burn-through, deformation and other defects.

Cold and hot cracks, inclusions, porosity, undercuts, unfused, unwelded.