Stainless steel pipe welding operation
Stainless steel pipe welding operation
Stainless steel pipe The most commonly used welding method is manual welding (MMA), followed by metal pole gas shielded welding (MIG / MAG) and tungsten inert gas shielded welding (TIG). Stainless steel pipe production and processing enterprises experts will be introduced to you in turn.
Introduction of stainless steel pipe manual welding
Preparation before welding: 4mm about the thickness of the open without breaking, direct welding, single-sided penetration through. 4 to 6 mm thickness butt welds can be used without breaking the mouth joint double-sided welding. 6 mm above, generally open V or U, X-shaped groove.
Second: the weldment, fill the wire to degrease and descaling. To ensure the quality of welding.
Welding parameters: including welding current, tungsten diameter, arc length, arc voltage, welding speed, protective air flow, nozzle diameter and so on.
(1) Welding current is a key factor in determining weld formation. Usually based on weldment material, thickness, and groove shape to decide.
(2) the diameter of the welding electrode according to the size of the welding current, the greater the current, the greater the diameter.
(3) arc and arc film, arc length of about 0.5 to 3mm, the corresponding arc voltage of 8 ~ 10V.
(4) welding speed: the choice should take into account the current size, weldment material sensitivity, welding position and mode of operation and other factors.
The following professionals from the stainless steel pipe enterprises engaged in welding technology Detailed description of stainless steel pipe manual welding (MMA) Related operations:
Manual welding is a very common and easy to use welding method. The length of the arc is adjusted by the person's hand, which depends on the size of the gap between the electrode and the workpiece. At the same time, when used as an arc carrier, the welding electrode is also a weld filler.
This welding method is very simple and can be used to weld almost all materials. For outdoor use, it has a good adaptability, even underwater use is no problem. In the electrode welding, the arc length depends on the human hand: When you change the gap between the electrode and the workpiece, you also change the length of the arc. In most cases, the use of direct current welding, the electrode as an arc carrier, but also as Weld filler material. The electrode consists of alloy or non-alloy metal core and electrode coating, this layer of skin to protect the weld from air damage, while stabilizing the arc, it also causes the formation of slag layer to protect the weld to shape it. The electrode can be either a titanium electrode or a base, depending on the thickness and composition of the coating. Titanium electrode is easy to weld, weld flat and beautiful, and easy to remove the welding slag. If the electrode is stored for a long time, it must be re-baked because the moisture from the air will accumulate quickly in the electrode.
Stainless steel tube with flux cored wire welding points and precautions:
(1) the use of flat-type welding power supply, DC welding using reverse polarity. Use the general CO2 welding machine can be welded, but the pressure of the wire to send a little loose.
(2) the protection of gas is generally carbon dioxide gas, gas flow to 20 ~ 25L / min more appropriate.
(3) the distance between the tip and the workpiece to 15 ~ 25mm is appropriate.
(4) dry elongation: the general welding current of 250A below about 15mm, 250A or more when about 20 ~ 25mm more appropriate.
