How to deal with stainless steel solder joints? Stainless steel spot welding methods and skills

Electropolishing. Chemical polishing.

Mechanical polishing. Generally, the weld polishing machine is used for polishing, which is simple and convenient.

Name: Weld polishing machine is also known as weld bead treatment machine, weld bead cleaning machine, weld seam cleaning machine, welding care machine.

Performance characteristics: Weld polishing machine, also known as weld bead treatment machine, it can efficiently deal with the black tungsten point of the weld bead generated when the argon arc welding machine welds stainless steel products. This machine adopts imported electronic components, relays and high-speed rectifier tubes, automatic short-circuit protection, flexible, convenient and safe operation, and is a good helper for stainless steel products and engineering companies.

Instructions for use of weld polishing machine:

1. Plug the power supply into AC220V, connect the processing gun to the corresponding terminal, plug in the control cable, turn on the power switch, and the power indicator (i.e. red light) will be on. Wrap the nozzle of the treatment nozzle with the treatment cloth dipped in the treatment liquid, easily press the micro switch, wipe the black welding bead, the black disappears immediately, and you can wipe it with a wet cloth with water after treatment, the effect is better.

2. If there is a short circuit between the processing gun and the workpiece during work, the fuse (resei) will automatically disconnect and stop working, at this time, you only need to press the fuse (resit) to continue working.

Precautions for weld polishing machine:

1. When using this machine, you must wear a mask and gloves, and beware of spraying the treatment liquid into the human eye.

2. Do not switch the machine panel to the workpiece and the processing gun.

3. When using, the handling gun must be wrapped with a processing cloth.

It is important to re-passivate the corroded areas with pickling paste or spray to form a chromium oxide film to restore their corrosion resistance, and after pickling, it is important to rinse properly with clean water in order to remove all contaminants and acid residues. After all treatments, re-polish with polishing equipment and close with polishing wax.

If the solder joint treatment of the finished color stainless steel product is a bit troublesome, because the vacuum titanium plated tube is made of colored plating, and then cut the material, the process requirements for the processing master are also relatively high, and the control ability of spot welding is required to be very strong. It can't be treated with traditional grinding and polishing, because grinding and polishing will throw away the color of the surface, so I recommend the following methods for your reference:

1.Spot paint. The most direct way is to use the repair paint that wants to correspond to the color, pay attention to the point, spray the paint on the bottle cap, use a brush to point on the solder joint, just a little on the line, the area of the point should not be too large, to prevent the broken pipe surface;

The stainless steel spot welding technique is to adjust the current to about 40, shorten the tungsten electrode as much as possible, and lay the welding wire flat.

The discharge time should not be too long.

The general thin tube uses 30+ current, and the specific current should be based on the individual's control ability. Wear a mask, start the arc on the pipe surface, do not on the end face of the nozzle, burn the pipe surface appropriately, and wait until the spot welding wire is burned until the solder joint is fused after the molten pool appears.

Another is the high current, the current is theoretically the general welding machine can go directly to the end, and the control ability is higher. If there is no gap between the end face and the pipe surface, you can grind the black pole into a needle shape at this time, and then put the black pole tip infinitely close to the tight joint, pay attention to the angle of the welding gun, and then complete the electric welding with instantaneous action, and the hand should be stable to prevent the black pole from sticking to the weldment.

In fact, in the actual construction, we should consider not only the construction cost, but also the welding quality and construction progress according to the specific conditions of the site, and reasonably select the construction process.

Surface treatment method after stainless steel welding: After stainless steel welding, it should be treated, such as cleaning, protection, anti-oxidation, grinding and polishing, wire drawing, etc. Here's how:

1. The weld must be pickled and passivated to remove the oxide scale on the weld, so that it can regenerate an oxide film and play a role in corrosion resistance. 2.There are two pickling methods, dipping method and brushing method, dipping method is suitable for small objects, can be directly put into the acid, for large objects, such as pipes, etc. can not be immersed in the container, so be sure to use the brushing method, that is, keep brushing until the formation of white bright color, and then rinse it off with water.

3.After the pickling is completed, there will be a passivation treatment, which is to apply the passivation solution on the surface of the object, then rinse it with cold water, scrub it again and then rinse it with warm water.

Summary. The reason for rust in stainless steel welds is that when the welder arcs on the surface of the stainless steel metal during the welding process, the protective film of the stainless steel is damaged, leaving a potential corrosion site.

Treatment method of rust at stainless steel welding.

Toothpaste: Gently rub the circle with toothpaste on the rusty area of the stainless steel weld, which can reduce the rust condition and prevent rust in the short term. The principle is that the fluoride in the toothpaste replaces the oxygen in the rust component, and it can play a role in removing rust stains.

Sulfuric acid: Gently rub the rusty place at the stainless steel weld with diluted sulfuric acid, and then wipe it with clean water, pay attention to the fast operation to avoid corrosion. The principle is that iron and sulfuric acid will produce chemical reactionFe2O3 + H2SO4 = Fe2 (SO4)3 + 3H2O, but this method has problems such as slow speed, high cost and large environmental pollution.

Detergent: Detergent containing bleach must be rinsed, rinsed, rinsed and rinsed again as soon as possible in the rusted area of stainless steel welds, and wiped clean immediately. The principle is that oxygen protects the blunt film of stainless steel.

How to deal with rust at the weld of stainless steel.

The reason for rust in stainless steel welds is that when the welder arcs on the surface of the stainless steel metal during the welding process, the protective film of the stainless steel is damaged, leaving a potential corrosion site. Treatment method of rust at stainless steel weld Toothpaste: Gently rub the circle with toothpaste on the rusty place of stainless steel weld, which can reduce the condition of rust and prevent rust in the short term.

The principle is that the fluoride in the toothpaste replaces the oxygen in the rust component, and it can play a role in removing rust stains. Sulfuric acid: Gently rub the rusty place at the stainless steel weld with diluted sulfuric acid, and then wipe it with clean water, pay attention to the fast operation to avoid corrosion.

The principle is that iron and sulfuric acid will produce chemical reactionFe2O3 + H2SO4 = Fe2 (SO4)3 + 3H2O, but this method has problems such as slow speed, high cost and large environmental pollution. Detergent: Detergent containing bleach must be rinsed, rinsed, rinsed and rinsed again as soon as possible in the rusted area of stainless steel welds, and wiped clean immediately.

The principle is that oxygen protects the blunt film of stainless steel.

How long do these methods stay rust-free?

Is there a better way to do it for a long time.

The method of permanent rust-free is to sand it off with an angle grinder and re-weld.

1. Keep the material clean (clean the material before welding), and prevent the influx of carbon, oxygen, nitrogen and other impurities from the outside during welding (check the purity of argon and maintain sufficient argon shielding);

2. Avoid excessive polishing, and consider cooling and heat dissipation measures.

3. Soak it in an acidic solution to dissolve it.

4. Treat the surface, coat it with a layer of lead, and then coat it with paint;