What is the hardness of argon arc welding, white steel electrode after welding?

Generally 50-60 degrees.

White steel. The welding rod is the welding rod used to weld stainless steel, and the welding core is made of stainless steel wire. The outer pressure is coated with a medicated coating.

Precautions for use.

1. Chromium stainless steel has certain corrosion resistance (oxidizing acid, organic acid, cavitation.

Heat and abrasion resistance. It is usually used in power stations, chemical industry, petroleum and other equipment materials. Chromium stainless steel has poor weldability, and attention should be paid to the welding process.

Heat treatment conditions and selection of suitable welding electrodes.

2. Chromium 13 stainless steel has large hardening after welding, and is prone to cracks. If the same type of chromium stainless steel electrode (G202, G207) is used for welding, it must be preheated at more than 300 meters and slowly cooled at about 700 meters after welding. If the weldment cannot be heat treated after welding, chromium nickel should be used.

Stainless steel electrodes (A107, A207).

3. Chromium 17 stainless steel, in order to improve corrosion resistance and weldability, appropriately add an appropriate amount of stability elements Ti, NB, Mo, etc., and the weldability is better than that of chromium 13 stainless steel. When using the same type of chromium stainless steel electrode (G302, G307), it should be preheated at more than 200 meters and tempered at about 800 meters after welding. If the weldment cannot be heat-treated, chromium-nickel stainless steel electrode (A107, A207) should be selected.

4. Chromium-nickel stainless steel electrode has good corrosion resistance and oxidation resistance, and is widely used in chemical, fertilizer, petroleum and medical machinery manufacturing.

5. When chromium-nickel stainless steel is welded, it is precipitated by repeated heating, which reduces corrosion resistance and mechanical properties.

6. Chromium-nickel stainless steel coatings are titanium calcium type and low hydrogen type. The titanium-calcium type can be used for AC and DC, but the penetration depth is shallow during AC welding, and it is easy to redden, so DC power supply is used as much as possible. Diameters and below can be used for all-position weldments, and above for flat and fillet welding.

7. The electrode should be kept dry when used, the titanium calcium type should be dried at 150 for 1 hour, and the low-hydrogen type should be dried at 200 250 for 1 hour (the drying can not be repeated many times, otherwise the coating is easy to crack and peel off), so as to prevent the electrode coating from sticking to oil and other dirt, so as not to increase the carbon content of the weld and affect the quality of the weldment.

8. In order to prevent inter-eye corrosion due to heating, the welding current should not be too large, about 20% less than the carbon steel electrode, the arc should not be too long, the interlayer is fast cooling, and the narrow welding bead is appropriate.

9. Welding rods should be carefully selected for the welding of dissimilar steels to prevent thermal cracks or phase precipitation caused by high temperature heat treatment caused by improper selection of welding rods, so that the metal is embrittle. Refer to the welding rod selection standards of stainless steel and dissimilar steel for selection, and adopt appropriate welding process.

You need hardness, the requirement of welding is to use argon arc welding to weld white steel, then what you need should be wear-resistant electrode, the selection of wear-resistant welding consumables is according to your requirements, how much hardness of argon arc welding wire you need, whether there are cracks after welding, which type of base metal needs to be welded according to these can recommend the welding consumables you need to use, if you need to know more about it, you can see my information and ask yourself. Shanghai Xirui welding consumables.

It depends on the specific requirements, the flatness of the weld, the size of the deformation, whether it is polished or not (just throw a light), OK. Under normal circumstances, the board is welded well and has a certain deformation, the size is only, if you want to reduce it, try it according to the steps below:

1. Try to reduce the gap between the weldments. (The tighter, the better).

2. If you want to fill the welding wire, the welding wire must be fine.

3. The current should be small, small enough to melt the welding wire, about 30A, the welding machine is different, and the imitation town is determined according to the welding machine.

4. The welding speed must be fast, the faster the better, the smaller the deformation, the more beautiful the weld, and it would be better if there was water cooling. Missing signs.

5. The welding machine is also particular, and the inverter AC and DC welding machine is generally selected, and the current is relatively stable. This kind of welder will be a little more expensive. It's all a matter of technique, just practice more!

Summary. The welding rod with the highest wear resistance and hardness should be high-speed steel electrode if it is tool steel, and high-speed steel electrode such as wewelding631 high-speed steel electrode welding, which is generally used for tool steel.

What electrode is the most wear-resistant and has high hardness White steel electrode.

The welding rod with the highest wear resistance and hardness should be high-speed steel electrode if it is tool steel, and high-speed steel electrode such as wewelding631 high-speed steel electrode welding, which is generally used for tool steel.

Wewelding631 High Speed Steel Electrode Technical Parameters Post-weld hardness HRC .........58-62 annealed (900) hardness HV30.........300 quenched (950 1200) hardness HRC .........62 tempered (530 1-2h) hardness HRC .........62

If the welding rod with the highest wear-resistant hardness is used for sand and gravel wear-resistant, the highest hardness should belong to the tungsten carbide series, the welding hardness of tungsten carbide electrode is one aspect, the key is the uniform wear-resistant hardness, which is the embodiment of good wear resistance, such as the use of wewelding645 high wear-resistant and high-impact sand and gravel wear-resistant welding rod.

A: Yes, the hardness will increase with the welding time. If the welding time is too long, the temperature of the weldment will increase, and the hardness of the weldment will also increase.

However, if the temperature is too high, the hardness of the weldment may become softer, so when welding the weldment with combustion in the argon arc weldment, you should pay attention to the inter-line of the welding to avoid the temperature of the weldment being too high and becoming soft.

Summary. Disadvantages of argon arc welding 1, argon arc welding because of the large heat-affected area, the workpiece after repair often causes deformation, too high hardness, sand hole, local annealing, cracking, pinholes, abrasion, scratches, undercuts, or insufficient adhesion and internal stress damage and other shortcomings. Especially in the process of repairing small defects in precision castings, the surface is prominent.

In the field of repairing defects of precision castings, cold welding machines can be used to replace argon arc welding, because the cold welding machine has small heat release, it better overcomes the shortcomings of argon arc welding and makes up for the repair problems of precision castings. 2. Argon arc welding and electrode arc welding compared with the degree of damage to the human body is higher, the current density of argon arc welding is large, the light emitted is relatively strong, the ultraviolet radiation produced by its arc is about 5 30 times that of ordinary electrode arc welding, infrared is about 1 times that of electrode arc welding, and the ozone content produced during welding is higher, therefore, try to choose a place with better air circulation for construction, otherwise it will cause great harm to the body. 3. For metals with low melting point and easy evaporation (such as lead, tin.

zinc), welding is more difficult.

Hello dear argon arc weldments, the hardness of the weldment will become larger after a long time.

Advantages of TIG weldingThe reason why TIG welding can be so widely used is mainly because of the following advantages. 1. Argon protection can isolate the adverse effects of oxygen, nitrogen, and hydrogen in the air on the arc and molten pool, reduce the burning loss of alloying elements, and obtain dense, non-leakage-hungry, high-quality welded joints; 2. The arc combustion of argon arc welding is stable, the return heat is concentrated, the arc column temperature is high, the welding production efficiency is high, the heat affected zone is narrow, and the weldment stress, deformation and crack tendency of the weldment are small;

3. Argon arc welding is open arc welding, which is convenient for operation and observation; 4. The electrode loss is small, the arc length is easy to maintain, and there is no flux and coating layer when the welding and excavation source is connected, so it is easy to realize mechanized thinking and automation; 5. Argon arc welding can weld almost all metals in high state, especially some refractory metals and easily oxidized metals, such as magnesium, titanium, molybdenum, zirconium, aluminum, etc. and their alloys; 6. It is not limited by the position of the weldment, and can be welded in all positions.

Disadvantages of argon arc welding 1, argon arc welding because of the large heat-affected area, the workpiece after repair often causes deformation, too high hardness, sand hole, local annealing, cracking, pinholes, abrasion, scratches, undercuts, or insufficient adhesion and internal stress damage and other shortcomings. Especially in precision castings, the repair process of small defects is prominent on the surface. In the field of repairing defects of precision castings, cold welding machines can be used to replace argon arc welding, because the heat of the cold welding machine is small, the shortcomings of argon arc welding are better overcome, and the repair problems of precision castings are made up.

2. The degree of damage to the human body is higher than that of argon arc welding and electrode arc welding, the current density of argon arc welding is large, the light emitted is relatively strong, and the ultraviolet radiation produced by its arc is about 5 30 times that of ordinary electrode arc welding, and the infrared ray is about 1 times that of electrode arc welding, and the ozone content produced during welding is higher. 3. For metals with low melting point and easy evaporation (such as lead, tin. zinc), welding is more difficult.

Do you believe that everyone should know what it is? It is also very versatile, and it is also one of the most popular materials so far, although white steel is a very common material, but it needs to be welded, I think everyone should know. So how do you weld white steel?

What are the process measures for white steel welding?

1. How is white steel generally welded?

The welding of stainless steel pays great attention to the certain influence of heat input on the welded joint, and in order to ensure the welding quality and efficiency under the premise, electrode arc welding is generally used. In addition, flux-cored wire gas shielded welding is also often used in the welding of stainless steel, but this welding method has strict requirements for the personal ability and responsibility of workers.

In addition, flux-cored wire gas shielded welding is prone to porosity in the welding process, so it is rarely used in the welding of pressure components in the petroleum and petrochemical equipment or pressure pipeline element industry.

There is also submerged arc welding. Under normal circumstances, the heat input of submerged arc welding is large, and the stainless steel components welded by submerged arc welding are prone to intergranular corrosion during use. Tungsten TIG welding is also often used in the welding of stainless steel.

TIG welding has the advantage of small heat input and is not easy to produce intergranular corrosion. However, its welding speed is low and the efficiency is not high.

Second, the process measures of white steel welding.

1. Preheating before welding, strictly keep the interlayer temperature should not be lower than the preheating temperature during the welding process.

2. Use low hydrogen or ultra-low hydrogen welding materials.

3. Increase the welding current, slow down the welding speed, appropriately increase the cross-sectional area and length of the positioning weld, and preheat if necessary.

4. The whole weld should be welded continuously as much as possible to avoid interruption.

5. The arc should not be triggered on the base metal other than the groove surface, and the arc pit should be filled when the arc is extinguished.

Third, the key points of white steel welding operation.

1. The white steel welding power supply should be DC positively connected; The length of the welding wire should be 800mm-1000mm per piece.

2. When all-position welding, the arc starts in the center of the gap at the upward welding position, and the arc should stay for a while after the arc is played, and when the molten pool at the arc initiation point presents a clear small dot and forms a bright and clear molten soft molten pool, it begins to move forward without swinging and filling the wire for uniform speed base metal self-fusion welding. The arc length is controlled at 2 4mm, for short arc welding, the arc is not allowed to go high and low, which is also to prevent the impact of the weld to give the width and penetration of the weld, and the tungsten needle should also be aligned with the weld to ensure the straightness of the weld.

The two half-turn welds can be turned off and re-jointed at 3 and 9 o'clock to facilitate the adjustment of gestures and torch angles (it is best to complete a single half-turn weld at a time, without pauses in between). Reduce the joint, the weld is more beautiful), the angle between the welding gun and the pipe surface should be kept at 80° 90° during the welding process. When the weld is rejointed, the arc superimposed welding 4 5mm length should be ignited before the original melt pool to heat, and the arc penetration weld should be found before welding.

3. After the weld is cooled, brush the pickling passivation paste on the surface of the weld, and after half an hour, wash it with a white steel wire brush and water until the surface of the weld is silvery-white.

It depends. There are several factors:

1 Selection of welding wire. The remelting process of aluminum alloy occurs in the weld area after fusion welding, and the composition of the weld is determined by the composition of the base metal and the welding wire, and at the same time, because some elements may volatilize under high temperature conditions, the composition of the composition is more complex, such as improper selection of welding wire or too long fusion welding time may make the weld become a non-heat treatment strengthened aluminum alloy, but in view of the fact that LD30 is a conventional grade, this reason is not very likely.

2 Selection of solution process Solution treatment must be carried out before aging treatment, so that the aluminum alloy can reach a supersaturated state, which is conducive to the precipitation and refinement of subsequent grains and the purpose of improving strength. I don't know if the landlord has carried out solid solution, and what is the solution temperature, time, and quenching medium selection, these are all influencing factors.

3 Establishment of the aging system The aging system is the next process of the solid solution, and the control factors are the aging time and aging temperature. If the aging temperature is too low or too high, it will affect the type and number of precipitated phases, and the effect after the effect will not be obvious. Under the premise that the aging temperature is appropriate, the extension of the aging time alloy should go through three processes: underaging, peak aging, and overaging, and the peak aging strength is the best if only hardness is required.

If the aging time is selected in the two areas of underage or excess, the effect of the treatment will not be too obvious.