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Due to its high impact strength and low elongation, 4130 Cr-Mo steel is widely used in sports equipment such as aircraft samples, racing car frames, anti-roll frames, dune bums, bicycles and motorcycles. Tungsten arc welding (GTAW) can be used to weld 4130 CrMo steel easily. The following are the most common problems of 4130 Chromium-Molybdenum materials using argon arc welding. The specific situation needs to be evaluated according to the practicle application.
Q: Can 4130 chromium-molybdenum material be welded by argon arc welding?
A: Yes, the argon arc welding of 4130 chromium-molybdenum materials has been used in the aerospace field for many years. As with all welddings, argon arc welding requires reasonable procedures and techniques. Impurities and stains on the surface of the steel pipe need to be cleaned with medium sandpaper and acetone, and burrs and corner tips need to be polishedto make a better the welding surface.
Q：Does it need preheating?
A:The parts of the thin-walled tube (thickness less than 0.12 “or 3mm) generally do not require A preheating temperature of about 149-204℃ to achieve the desired effect. But before welding, the steel pipe itself should not be lower than the room temperature of about 21 ℃。
Q: what kind of wire should be used?
A: There are many options for welding wire, but the ideal one is er80s-d2 which welding strength is basically close to the strength of the 4130 material itself. Er70s-2 can also be considered, with slightly weaker intensity but better ductility. However, through reasonable structural design (such as adding reinforcing bars or supporting tubes), multi-point support and longer welds can make up for the insufficient strength of the wire itself.
Q：Why is the welding wire made of 4130 not recommended?
A: The 4130 wire is generally used for the workpiece that will undergo heat treatment in the back pass. Due to its high hardness and poor ductility, it is not recommended for use in sports equipment such as aircraft, racing frames and tumbling frames. Some welders use austenitic stainless steel wire to weld 4130 steel tubes like 310 and 312 stainless steel welding wires. Other brands of stainless steel can cause cracking, and stainless steel welding wire is usually more expensive.
Q：Does 4130 steel pipe need heat treatment to remove stress after welding?
A: Generally, the thin-walled pipe does not need to be de-stressed, and the material with A wall thickness of more than 0.12 “or 3mm is best to do heat treatment after welding. The optimal temperature for pipe fitting treatment is 593 ℃. A neutral flame of oxygen and acetylene can be used for heating, which must be moved to avoid local overheating.
Q：Does material welding need back gas protection?
A: It is generally not necessary to weld the backing gas shield, although some welders do this, the backing gas shield is not bad for welding, and for some welds it will improve the welding quality of the bead.
Q：Can the welded workpiece be quenched?
A: No, rapid quenching of welding workpieces can cause many problems, such as cracks or laminar tears. Make sure that the workpiece is cooled naturally.
