Stainless steel welding requires auxiliary solder that is better for stainless steel welding, and 88C-F flux, which has stronger weldability. This operation is to use a heat source to heat the welding part to 250 degrees. Then use WEWELDING88C welding wire dipped in WEWELDING88C-F flux and apply it to the welding part to form.
Stainless steel is a special material, but it is not impossible to weld, but the flux must be used properly. In addition to the above flux, zinc sulfate can also be used to flux stainless steel, which is much easier than soldering iron or copper. The selection of soldering iron power during welding should be determined by the size of the part to be welded and the thickness of the stainless steel material. The power of the soldering iron is generally 75 watts.
The preparation method of zinc sulfate flux is: first pour sulfuric acid into a glass container, and then put zinc into the container (if there is no zinc, ordinary dry battery zinc sheets can be used). At this time, a chemical reaction will occur. White smoke will emit, wait until the reaction is completed and you can use it. Pay attention to safety when using it, because the substance is very corrosive. Once an object comes into contact with it, it should be washed with clean water quickly.
Extended information:
Precautions for stainless steel welding
1. Chromium stainless steel has certain corrosion resistance (oxidizing acid, organic acid, cavitation corrosion), Thermal and wear resistance. Usually used in power stations, chemical industry, petroleum and other equipment materials. Chromium stainless steel has poor weldability, so attention should be paid to the welding process and heat treatment conditions.
2. Chromium 13 stainless steel is highly hardenable after welding and is prone to cracks. If the same type of chromium stainless steel electrode (G202, G207) is used for welding, preheating above 300°C and slow cooling at about 700°C after welding must be carried out. If the weldment cannot be subjected to post-weld heat treatment, chromium-nickel stainless steel electrodes (A107, A207) should be used.
3. Chromium 17 stainless steel, in order to improve corrosion resistance and weldability, appropriate amounts of stabilizing elements Ti, Nb, Mo, etc. are added. The weldability is better than that of chromium 13 stainless steel. When using the same type of chromium stainless steel electrodes (G302, G307), preheating above 200°C and tempering at around 800°C after welding should be performed. If the weldment cannot be heat treated, chromium-nickel stainless steel welding rods (A107, A207) should be used.
4. When welding chromium-nickel stainless steel, carbides will precipitate under repeated heating, reducing corrosion resistance and mechanical properties.
5. Chromium-nickel stainless steel welding rods have good corrosion resistance and oxidation resistance and are widely used in chemical industry, fertilizer, petroleum, and medical machinery manufacturing.
6. Chromium-nickel stainless steel coatings are available in titanium-calcium type and low-hydrogen type. Calcium titanium type can be used for AC and DC, but the penetration depth is shallow during AC welding and it is prone to redness, so DC power supply should be used as much as possible. Diameters of 4.0 and below can be used for all-position welding parts, and diameters of 5.0 and above can be used for flat welding and flat fillet welding.
7. The welding rod should be kept dry when used. The calcium titanium type should be dried at 150°C for 1 hour, and the low hydrogen type should be dried at 200-250°C for 1 hour (drying cannot be repeated multiple times, otherwise the coating will be easy to cracking and peeling) to prevent the welding rod 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 times less than that of carbon steel electrodes. The arc should not be too long, and the interlayers will cool quickly. A narrow weld bead is preferred. .
Baidu Encyclopedia-Flux