Q1: What welding method is used for welding 6mm 316L stainless steel plate?
A: Manual argon arc welding (MTIG) or CO2 welding, manual stick welding can be used.
Manual argon arc welding: Choose ER316L welding electrode, with a thickness of 2.5mm or 3.2mm. When welding 6mm thick plates, the X-shaped groove can be used. Note that welding deformation must be taken into account and can be welded from both the front and back to neutralize its effects.
CO2 welding method: For optimal welding results, use an E316LT flux core welding electrode. The flux-cored electrode is more expensive, but offers better weld protection and minimal spatter. During operation, ensure adequate cleaning of the interlayer root by removing any film before proceeding to the next welding step.
Manual stick welding: Manual stick welding is also a processing option. Use an A207 electrode for welding. Remember to pay attention to cleaning the interlayer root when welding with this method.
Q2: The technique of argon arc welding for stainless steel thin plates
The outcome of your welding process depends on several factors, such as the smoothness of the weld, the amount of deformation, and whether or not grinding and polishing are involved. For a thickness of 0.7 mm, welding is relatively simple. However, welding plates with a thickness of 0.4-0.5 mm can be more challenging. It is common for some warping to occur when welding 0.7mm stainless steel plates, but there are steps you can take to minimize it:
- Minimize gaps between welds by ensuring they are as close together as possible.
- If the weld requires filler wire, be sure to use a thin wire (0.8mm is ideal).
- Use a low current setting (about 30A) to melt the filler wire, but remember that the specific current setting may vary depending on the welding machine you are using.
- Weld at high speed to minimize deformation and produce a more attractive weld. Using water cooling can further improve results.
- Consider using an inverter-type AC/DC welding machine as it provides a more stable current. Although these machines may be more expensive, they can lead to better results.
Ultimately, the key to successful welding is practice and technique.
Q3: What is the reason for blister for argon arc welding stainless steel plate?
Cases 1:
When I use argon arc welding to join two stainless steel plates, the initial welding is successful. However, there are some small holes, so I tried a second weld. But there were bubbles present. Could you explain the cause of this problem? Thanks!
Cases 2:
On my first welding, I found some small bubbles, so I tried to repair them with patch welding. However, the bubbles grew and could not be welded effectively. The material I used is 201 stainless steel with a thickness of 0.6 mm. Can you provide me with a solution to this problem?
A: There may be the following reasons:
- The welding seam is not clean. It has a little oil, water, etc.
- The shielding gas is not pure.
- The end of the wire is exposed to air.
Solutions:
- Polish out the bubbles with the angle grinder.
- Clean the weld surface.
(can be cleaned with acetone if necessary)
- Use 99.99% argon.
- The end of the welding wire must always be protected from inert gas.
Q4: In addition to argon arc welding, what else can be used to weld stainless steel plates?
A: Laser welding is better, but it is very expensive.
Q5: The problem of argon arc welding for 304#/201# 0.8mm stainless steel plate.
Cases 1: For argon arc welding of 304#/201# 0.8mm stainless steel, will the weld seam crack? Also, will grade 201 stainless steel rust in high temperatures of 150 degrees and 95% humidity?
A: In principle, it will not crack, but it will rust. Grade 201 stainless steel is very easy to rust.
Follow: Is the welding seam rusty or rusty in this high temperature and high humidity environment?
A: The 201# stainless steel plate rusts easily at the welding seam and scratched places. 201# stainless steel itself is not as resistant to oxidation and corrosion as 304 stainless steel. Its service life itself is short, but there will be no problems in a short period of time. Two or three years should be enough.
Q6: Can the 500A argon arc welding machine weld 1.2mm stainless steel plate? How to weld 1.2mm stainless steel plate?
A: Welding is also acceptable, but not too strong. First apply the phosphate liquid to the stainless steel and then weld it with the soldering iron.
It mainly depends on the workload, long time welding needs cold water welder, just a few welding points don't matter. The supplied current refers to 80-100A, argon gas.
Q7: What is the diameter of electrodes for 4mm stainless steel plate with argon arc welding?
A: For joint welding and V-groove welding, you should use 2.0mm electrodes to weld the bottom and use 3.2mm electrodes to weld the surface. If there is no requirement for mechanical properties, welding once with 4mm electrodes is ok.
Q8: For 2mm 304 stainless steel plate welding, argon arc welding and stick welding, which one is better?
A: Certainly argon arc welding is better. The advantages of argon arc welding in controlling deformation and burning are obvious, especially when welding high-alloy materials.
Q9: Can argon arc welding weld 0.2mm stainless steel and 2mm stainless steel together?
A: It can be welded, but this requires the welder to have high operational skills and suitable welding process.
Q10: For welding 3mm stainless steel plate with vertical position, what should be the current with 2.5mm electrodes?
A: Current adjustment range 95~110A. Normally, for 3mm sheet metal, continuous welding is not possible, only spot welding can be used. (if you adjust the current too large, it will burn; if it is too small, the electrodes will not burn)
During peak hours, adjust the electrical current to 105A and reduce to 100A during off-peak hours. Continuous arc welding is a highly technical process where current is an important factor, but the most crucial factor is the welder's skills. Only those who do not have the necessary skills resort to spot welding. A welder is someone who can successfully apply continuous arc welding to steel plates less than 2 mm thick.
Q11 ：What kind of electrode is used for welding 304 stainless steel sheet?
A: Model A132 or 137; ER-308L welding wire.
