50Mn steel welding request, what electrode is used for 50mn welding

Are you the fork in front of the excavator?

I've got some information stored on my computer, you can take a look.

1. Generally, the corresponding welding rod is selected according to the strength grade of the steel, and the welding structure size, shape, groove, working conditions, stress conditions, and comprehensive analysis are considered to select the required welding rod and process measures.

2. If the cooling speed of the weld is fast, the strength is increased, and the weld is prone to cracks, and the welding rod with a lower strength than the base metal can be selected.

3. In case of multi-layer welding of thick plates or normalizing treatment after welding, it is necessary to prevent the occurrence of low weld strength.

4. The selection of acid electrodes or alkaline electrodes of the same strength grade mainly considers the structural shape of the workpiece, the thickness of the steel plate, the working conditions, etc., and generally requires good plasticity, high impact toughness, and strong crack resistance, so alkaline (low hydrogen) electrodes should be selected.

5. For the dissimilar steel welding between carbon steel and low-alloy steel or between low-alloy steel and low-alloy steel, the welding rod corresponding to the steel with lower strength grade is generally selected.

6. For the welding of medium carbon steel, due to the high carbon content of the steel, the welding crack tendency is increased, and low-hydrogen electrodes can be selected. and take preheating and cooling measures.

7. Welding of cast steel, cast steel has a high carbon content, and the thickness is large, the shape is complex, and it is easy to produce welding cracks.

8. The current range of the welding electrode is provided, which is for reference only. The preheating of the workpiece can be 5% 15% lower than the normal current, about 10% smaller than the AC when DC is used, and about 10% 15% smaller than the flat welding current of vertical welding and vertical welding.

It is strongly recommended to preheat and keep warm before welding, annealing after slow cooling after welding, and the strip material should be as close as possible to the base metal material, and the hardness after welding is not enough to carburize.

Annealing process: heat to 150-230 °C for 5 minutes, slowly heat to 890-900 °C for 10 minutes, and then cool slowly.

Special electrodes, electric welding.

Ordinary electrode, carburizing and quenching after surfacing welding.

almiweld 855(855tig)

ALMIWELD855 is a highly versatile, high-efficiency, high-strength Indonickel alloy electrode (welding wire) with excellent plasticity, toughness, crack resistance, and is suitable for almost all common steels. It has excellent welding process performance, stable arc, easy slag removal, less spatter, and uniform and beautiful weld.

Uses: Suitable for welding tools and molds, high-speed tool steels, hot work tool steels, manganese steels, cast steels, T-1 steels, shock-resistant steels, vanadium-molybdenum steels, spring steels, martensitic stainless steels, austenitic stainless steels, ferritic stainless steels, unknown steels, and welding between various types of steels. For example, it is used for high-pressure valves, the removal of broken bolts, the modification of shafts, etc., and the effect is very ideal.

mechanical properties of welded joints;

Experimental Items Experimental results.

Tensile strength of 124,000 psi (pounds square inches) or 855 Newtons square millimeters.

Yield Strength 103,000 psi (pounds square in) maximum, or 710 Newtons square millimeters.

Elongation max. 22

Brinell hardness HB300 after welding, work hardening HB450

Reference current. Weld core diameter (mm).

Welding current (a) 30 40 40 80 65 120 90 150

Notes: 1: ALMIWELD855 has a very favorable thermal expansion and contraction ratio, which can minimize cracks and twisting.

2: When welding crack-sensitive case-hardened metals, low-layer welds are ideal.

3: Bevel cut heavy parts to form a 90-degree V-shaped groove.

4: High-carbon steel needs to be preheated to 200 degrees Celsius.

5: Maintain a short arc length and use a narrow weld bead to prevent overheating.

6: Allow the weld to cool down before removing the slag.

7: At operating temperatures up to 450 degrees Celsius, ALMIWELD855 can still maintain high strength and ductility.

What electrode is used for 50Mn, J426, J427, J506, J507 can be used for welding.

50MN has high strength, elasticity and hardness, and is mostly used after quenching and tempering, and the welding performance is poor. 50mn round bars are used to manufacture heat-treated parts under high load with high wear resistance requirements, such as gears, gear shafts and mandrels, with a cross-section of less than 80mm. The performance is similar to that of No. 50, but its hardenability is higher, and the strength, hardness and elasticity are slightly higher than that of No. 50 steel after heat treatment.

Poor weldability, with overheating susceptibility and tempering brittleness tendency. It is used as a stress part, a high wear resistant part, and a high stress part, such as a mandrel with a diameter of less than 80 mm. After high-frequency quenching, it can also manufacture train shafts, worms, connecting rods and automobile crankshafts, such as gears, gear shafts, friction plates, mandrels, plate springs, etc.

Consider using austenitic stainless steel electrodes.

Reply 5 50mn High Quality Carbon Structural Steel Manganese Mn: The performance is similar to that of No. 50, but its hardenability is higher and its strength after heat treatment. Hardness.

The elasticity is slightly higher than that of No. 50 steel. Poor weldability, with overheating susceptibility and tempering brittleness tendency. Used as a stress-bearing part.

High wear-resistant parts, such as gears. Gear shafts. Friction discs.

Mandril. Flat springs, etc. Manganese can improve the hardenability of steel, strengthen ferrite, and improve the yield strength, tensile strength and wear resistance of steel.

Usually, the grade of steel with high manganese content is marked with "MN", such as 15mn and 20mn, to distinguish it from carbon steel with normal manganese content. The above is for me to find.

It is carbon knotted steel, and the image of Yang Gongtou is not the youngest son who was born in Pingyin.

The first floor of this question has its own answer, and it is not that I don't understand the ingredients, so the introduction is not necessary. I have also thought about this problem, and I didn't pay attention to find an authoritative explanation, so I can only guess that silicon-manganese is a normal element in general steel, and it is a matter of the upstream industry, of course, there are sulfur, phosphorus, oxygen and nitrogen, etc., and the normal content needs to be controlled, so if it is not very high, it will not be included in the alloy steel, and the proportion of intentional addition will be increased before this column is drawn, and there is a similar situation in low-carbon steel. There are similar examples of ductile iron, where the silicon content is not very high, and the name is not even marked in the category, and it only has its place when it is high in silicon.

I guess it's conventional.