Low carbon just in the use of argon arc welding, during welding, a small line appears in the weld be

When mild steel is welded with argon arc, the appearance of a thin line in the weld bead may be caused by the following reasons:

The quality of the welding material is not good or there are too many impurities, which will lead to porosity or inclusions during welding, resulting in the formation of fine wires in the weld bead.

The unstable welding current or severe electrode wear can lead to an unstable arc during welding, resulting in the formation of thin wires in the weld bead.

If the welding speed is too fast or the movement is unstable during welding, the welding material will not melt sufficiently during welding, resulting in the formation of fine wires in the weld bead.

Insufficient shielding gas or unstable shielding gas flow during welding can lead to oxidation of the welding material, resulting in the formation of tiny wires in the weld bead.

In response to this situation, the following measures can be taken:

Choose the best welding materials and make sure that the surface of the welding materials is clean.

Make sure that the welding current is stable and replace the electrodes regularly.

Control the welding speed and keep the movement stable during welding.

Ensure that the shielding gas is sufficient, and control the shielding gas flow to be stable.

Hope the above can be helpful to you.

There are many reasons for this, the first is that you have failed to melt through the base metal and directly cover it with weld water. Second, the argon gas is too large, and the argon gas blows the welding water, which cannot evenly cover the weld. Third, the current is too large, and the wire speed is too fast!

TIG welding. God-level players, professional answers to all kinds of incurable diseases! If you don't understand a friend, please ask and refuse to add friends!

The welding torch is fast, and the welding wire can't keep up.

That's the hardness of the material, and there is a crack next to the weld. Die steel often has this kind of problem, plus points, I can solve your problem.

When you say explosive lines, I understand that it should be thermal cracks. There are several factors that contribute to the development of thermal cracks: bevel cleaning, welding consumables selection, welding parameters.

1. First of all, it depends on the selection of welding consumables, and the welding consumables must be selected correctly 2. The welding place of the base metal must be polished.

3. Ensure the adequacy and purity of argon gas.

4. Considering the nature of the base metal, whether it needs to be preheated, heat treated, and slow cooled.

It must be caused by intergranular corrosion!

1. Causes of stomata

1) The weld was not cleaned in time. If not removed in time, it will cause no fusion during welding, and wrinkled skin will be formed on the surface of the weld surface or internal pores and slag inclusions will be formed on the surface of the weld, which will directly affect the welding quality.

2) The wind speed is too high when working. When the actual counterpart gap is too large, the transition layer needs to be surfacing on the bevel side of the pipeline. Set up temporary shelter facilities to strictly control the wind speed at the welding operation, because the wind speed exceeds a certain range, it is easy to produce pores.

2. Causes of cracks:

1) Arc extinguishing too fast. Arc extinguishing is different from electrode arc welding, if the arc is extinguished too quickly, it is easy to produce arc pit cracks, so the weld pool should be led to the edge or thicker part of the base metal during operation, and then gradually shrink the molten pool and slowly extinguish the arc, and finally close the shielding gas.

2) Use hot die casting mold. Hot die casting molds often have tortoiseshell cracks, most of which are caused by thermal stress, but also caused by surface oxidation or corrosion of die casting raw materials, heat treatment to adjust to appropriate hardness to improve its life, too low or too high hardness is not applicable.

Improper arc closing method. The crater is not filled. The arc crater should be filled, and the arc extinguishing should be drawn obliquely upwards by using an attenuation device.

The low-lying part of the arc pit formed at the end of the weld bead due to improper arc closing and arc breakage. Reason: Short wire residence time and insufficient filler metal.

Hazards: Reduction of the cross-sectional area of the weld; The reaction at the arc pit is not sufficient, and it is easy to produce segregation or impurity accumulation, so there are often pores, ash and cracks at the arc pit.

I'm a Yahoo welder who welded pipes, maybe.

The words that come out are not professional enough, but they are absolutely correct After the welding is over, there are pores in the broken arc, I don't know the reason, but I know how to solve it, you can fill the wire before the end arc, you can effectively fill the pores, cracks, I guess you weld relatively thin, you can fill more wire, if there is more, I think it is basically a problem of the process.

The power of the welding machine you use is too small, the welding depth is not enough, and the weld cracks after grinding.

1. The current is too small. 2 rows into pores, 3 did not weld, 4 welded and 4, and there was crack in the weld after grinding.

It is usually said that there is still slag protrusion on the inner wall of the weld bead because the heat in the welding is too high, there will be something like slag, which can be wiped off with a cloth, of course, if only one or two of these millimeters are protruded is a normal phenomenon (the case of thick materials), if there is too much molten iron or uneven molten iron is your technical problem

Porosity problem of argon arc welding: do a good job of cleaning before welding, you can avoid air control problems

The purity of the gas is not up to the requirements. Before formal welding, test welding in the cleaned iron plate, do not add wire, if there is a pores, the gas needs to be replaced; The air flow is too high, or too small. The size of the air flow should be adjusted according to the size of the nozzle, generally the larger the nozzle, the larger the air flow; Gas turbulence.

When there is splash in the nozzle, or the tungsten chuck expands;

Broken trachea. When the trachea is damaged, it will appear when the arc is started by welding or when it is formed shortly after the arc starts, and then it will return to normal. Excessive ambient airflow.

Generally, when the wind speed reaches more than 3m s, it is easy to blow away the shielding gas. The diameter of the nozzle is too large, or too small. The extension length of the tungsten electrode.

Generally 2 3 times the diameter of the tungsten electrode;

Attention TIG welding novices! The argon arc soil puts the "vent hole" for these 3 reasons, absolutely dry!