Do you have to use sulfuric acid to weld something?

Soldering things doesn't have to be soldered with sulfuric acid to be able to solder objects, but in other words, some metals can only be soldered with matching flux, and some materials don't require flux, such as copper.

The pipe is made of phosphor copper welding wire.

Or silver phosphorus copper wire welding can be welded without flux, while pure aluminum, stainless steel, and iron welding need to be welded with flux.

1. For example, whether the welding of pure aluminum is with a soldering iron or with flame welding, it needs to be soldered with flux, 4047 aluminum-silicon welding wire with 53-F flux powder for high temperature, and wewelding M51 welding wire with M51-F flux for low temperature.

2. If it is stainless steel welding, low-temperature welding should be welded with low-temperature 250 degrees wewelding88C welding wire with 88C-F flux, if you don't use flux, you can't weld, but you don't have to use sulfuric acid flux. If it is a high temperature, it is welded with silver alloy wire and 201-f silver flux paste.

Not really.

Generally speaking, hydrochloric acid is used to treat the surface of the object instead of sulfuric acid, which is not easy to weld successfully. The principle is that the oxides on the surface can be removed after hydrochloric acid treatment.

1. Your narrative is not clear enough;

2. What do you weld? Is it soldering with an electric soldering iron?

3. There is no sulfuric acid as flux, only zinc chloride generated by hydrochloric acid and zinc is used as flux;

4. In addition to using zinc chloride as flux, there is also a special solder paste. These two fluxes can only weld ordinary iron products;

5. If it is a soldering circuit board, you can only use rosin alcohol flux, which is a flux that dissolves rosin in alcohol. Because zinc chloride and solder paste are very corrosive, they should never be used for soldering circuits.

This is definitely not, I have never seen some precision instrument welding, but the welding on the construction site never uses sulfuric acid.

Hydrochloric acid is volatile, volatilized by high heat during welding, and if there is residue with sulfuric acid, then it will corrode the rail.

For brazing, flux is needed, there are many kinds of flux, including acid flux, that is, hydrochloric acid dissolved zinc particles after making, a large number of rosin flux, the role of flux is to remove the oxide layer on the surface of the article.

Remember that when starting the arc, if the alkaline electrode is not directly hit the weldment, to draw the arc, is to scratch the place to be welded, and wait for the arc to receive the weld bead immediately, and the direct hit is easy to stick. There is also the heat of the welding rod because it has been stuck for a long time, and the core of the welding rod is overheated due to short circuit.

In this case, it depends on what you are welding, you need to use sulfuric acid to use it, and there is no need to use it when you don't need it.

Dilute sulfuric acid is acidic, and the oxide layer on the metal surface can be removed by changing the trace, which is a better welding effect and is not easy to rust and desolder.

Iron: Fe2O3+3H2SO4===Fe2(SO4)3+3H2O

Aluminum: Al2O3+3H2SO4===AL2(SO4)3+3H2O

Dilute sulfuric acid is acidic, which can remove the oxide layer on the metal surface, which is a better welding effect and is not easy to rust and desolder.

Sulfuric acid and hydrochloric acid are not suitable for flux, depending on what you want to weld, generally speaking, rosin is the best flux, but if you want to weld ironware, such as enamel basins and other things can use solder paste, of course, you can use diluted hydrochloric acid to remove rust, and the welding effect will be better.

Industrial production method of sodium hydroxide (1) Filtration of seawater.

2) Add excess sodium hydroxide to remove calcium and magnesium ions, filter CA(2+)+2OH(-)=CA(OH)2 (slightly soluble) MG(2+)+2OH(-)=mg(OH)2 (3) Add excess barium chloride to remove sulfate ions, filter BA(2+)+SO4(2-)=BASO4 (4) Add excess sodium carbonate, remove calcium ions, excess barium ions, and filter CA(2+)+CO3(2-)=CAC3 BA(2+)+CO3(2-)=baCO3 (5) Add an appropriate amount of hydrochloric acid to remove excess carbonate ions.

2H(+)CO3(2-)=CO2 +H2O(6) Heating to remove carbon dioxide.

7) Sent to the ion exchange tower to further remove calcium and magnesium ions (8) electrolysis.

2NaCl + 2H2O = (energized) H2 + Cl2 +2NaOH

The excess hydrochloric acid is evaporated when heated during welding.

Sulfuric acid cannot, the residue corrodes the metal!

These two substances are harmful to the physics of iron, they have low temperature cold brittleness, if used, the metal surface will be cold brittle at low temperature and lose impact resistance.

Sulfur is a harmful substance in the metal, the content should be strictly controlled, and the residual sulfuric acid welding high temperature can produce brittle iron sulfide with high hardness. This is not the case with hydrochloric acid.

The excess hydrochloric acid is evaporated when heated during welding.

Sulfuric acid cannot.

Dilute sulfuric acid can remove the oxide layer on the metal surface, so that the welding effect is better, and it is not easy to rust and desolder.

Iron: Fe2O3+3H2SO4===Fe2(SO4)3+3H2O

Aluminum: Al2O3+3H2SO4===AL2(SO4)3+3H2O

It is used to wash off the rust (Fe2O3) on the surface, making it easier to weld. fe2o3+h2so4=fe2so3+h2o

Remove the oxide layer, i.e., rust (Fe2O3) 3H2SO4 + Fe2O3 = Fe2 (SO4) 3 + 3H2O

Favorable for welding.

Hydrochloric acid is volatile, volatilized by high heat during welding, and if there is residue with sulfuric acid, then it will corrode the rail.

Sulfuric acid 15-20% good rust removal effect higher than 60% is passivated can not get up rust removal effect and sulfuric acid contains 2 hydrogen atoms after use The material will change.

Hydrochloric acid is volatile, volatile at high temperature, and it is safer to use than sulfuric acid;

Sulfuric acid is corrosive, not volatile, and there will be residues, and the residual sulfur element in the welding will seriously affect the quality of the weld, which is the most important.

Comparatively speaking, hydrochloric acid is better, because hydrochloric acid has no oxidizing properties, while sulfuric acid has a strong oxidizing ability.

Moreover, the risk of sulfuric acid is higher, and there will be more sulfuric acid residues, which is inconvenient to clean.

Brother, I'm working on this as well. I used protection welding, welded once. Gently.

It's just a hole. Welding is the stability of welding. But it's not good to weld.

I solder with 70w. I don't know why the welding doesn't stick. Netizens said that the wattage is small.

To use 500w welding. Too expensive to buy. Find it simple with an effective welding method!

Disconnected saw blades and rosin.

The function of concentrated sulfuric acid is to remove the oxide layer on the surface, you can use a saw blade to collapse the oxide layer, and then weld it with rosin.