51CrV4 Steel Plate

Products Description The weldability of 51CrV4 steel plate is poor and the cold deformation plasticity is low. The following are the welding process and precautions for it: Welding process : Welding method : Generally, welding methods such as argon arc welding are adopted. For example, in order...

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Description

Products Description

Chemical composition

Name	Number	C	Si	Mn	P	S	Cr	V
					max.	max.
51CrV4	1.8159	0,47-0,55	max.0,40	0,70-1,10	0,025	0,025	0,90-1,20	0,10-0,25

Mechanical properties in different treatment conditions

Quenched and tempered Q+T
Heat treatment diameter in mm	0.2% proof stress(Rp 0.2) min. N/mm²	Tensile strength in N/mm² Rm min.	Elongation at fracture in % A min.	Reduction of area at fracture in % Z min.	Notch impact energy (ISO-V) in J KV min.
≤ 16 >16≤ 40 >40≤ 100 >100≤ 160 >160≤ 250	900 800 700 650 600	1100-1300 1000-1200 900-1100 850-1000 800-950	9 10 12 13 13	40 45 50 50 50	30 30 30 30 30

Welding process:

Welding method: Generally, welding methods such as argon arc welding are adopted. For example, in order to reduce electrode consumption, direct current electrode positive connection can be selected for the butt welding test of wire materials, that is, the wire material is connected to the positive pole of the power supply and the tungsten electrode is connected to the negative pole.

Welding materials: Select appropriate welding materials. For instance, tungsten electrodes containing 1% or 2% thorium oxide have high electron emission efficiency, good current carrying capacity, good anti-pollution performance, easy arc ignition and stable arc. Argon can be selected as the shielding gas, as its low arc voltage characteristic is particularly beneficial for manual arc welding of thin plates and wire materials.

Welding parameters: Before welding, carefully grind the two ends of the steel wire flat and clean the oil stains at the ends with acetone. Place the wire materials with ground ends on a flat and clean alignment plate, align the two ends, leave no gap at the joint, and press both sides of the joint with an iron weight. Connect the wire material to the positive pole of the welding machine and the tungsten electrode to the negative pole. Adjust the current to 20A, 15A, 10A, and 8A for welding respectively. The test found that when the current is 20A, the arc burns violently, there is serious metal splash at the joint and the weld point collapses seriously; when the current is adjusted to 15A, the arc burns relatively stably, there is less spatter in the molten pool, but the weld still collapses; when the current is reduced to 10A, the arc is easy to ignite and the arc is stable.

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