Precautions for steel casting welding 5

The steel castings are welded by special alloy steel electrode Wewelding600, and the cast steel can be welded directly by cold welding process.

Characteristics of wewelding600 alloy steel electrode.

Wewelding 600 alloy steel electrode is a kind of low heat output, suitable for all-round welding of special nickel-chromium alloy steel electrode, extremely versatile, high-strength general base metal strength design, with excellent welding process performance, arc stability, uniform and beautiful weld, in the presence of oil, water and rust conditions can also be excellent welding effect, can weld different steel.

Application of WeWelding600 alloy steel electrode.

It is suitable for welding tools and molds, high-speed tool steels, hot work tool steels, manganese steels, cast steels, T-1 steels, seismic 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.

Technical parameters of WeWelding600 alloy steel electrode.

Tensile Strength: 125,000 psi (862MPa)Yield Strength: 90,000 psi (620MPa)Elongation: 35%.

Hardness after welding: HRC23 (HRC47 after work hardening) Power supply selection: AC and DC dual-purpose, DC reverse connection when DC.

It should be steel castings surfacing welding.

Welding method: manual arc welding.

1 Warm up. The preheating temperature of the weld is 125 200 (the preheating range is 75 mm from the center of the weld), and it is heated with a flame, which must be slow and uniform to avoid cracks and deformation.

2 inter-layer temperature control.

The interlaminar temperature of the weld is 125 250, and the lower limit of the temperature is used to ensure that the rear weld has the minimum preheating conditions in the multi-layer weld, and the upper limit of the temperature is to avoid thermal stress cracks. The interlayer temperature is controlled by supplemental heating or slow welding.

3 Post-weld heat treatment.

The weld area is heated to 200 250 °C with a flame, kept warm for hours and covered with fireproof rock wool, and then allowed to cool slowly.

Hope it helps, dear

CO2 semi-automatic gas shielded welding of steel parts manual arc welding "Welding Process Specification Manual" welding method CO2 semi-automatic gas shielded welding manual arc welding.

Cast steel: Cast steel is an iron-based alloy used to produce castings without undergoing eutectic transformation during the solidification process, which is a kind of cast alloy. Cast steel is an alloy with iron and carbon as the main elements, with a carbon content of 0-2%.

Cast steel is divided into three categories: cast carbon steel, cast low alloy steel and cast special steel.

Cast steel: Cast steel is a general term for iron-based alloys used to produce castings that do not undergo eutectic transformation during the solidification process. A type of cast alloy. Cast steel is divided into three categories: cast carbon steel, cast low alloy steel and cast special steel.

Carbon steel, also known as carbon steel, refers to an iron-carbon alloy with a carbon content less than WC. In addition to carbon, carbon steel generally contains a small amount of silicon, manganese, sulfur and phosphorus.

Therefore, to know the specific material to decide what electrode to use, the general principle of choosing electrodes is that the welding of two different base metals, the material of the welding rod should be similar to the metal composition of the two base metals. For the same material, it is necessary to choose a welding rod with the same metal composition as possible with the base metal.

And the treatment after welding is not the same, it also depends on the material. Some materials can not be treated with other treatments, while some materials will have internal stress due to temperature changes during and after welding, and annealing treatment is also required. Even some materials need to be heated to high temperatures before they can be welded, and they need to be returned after welding.

The following two types of welding consumables can be selected according to the specific workpiece material.

Z308 cast iron electrode.

Model GB T:EZNI-1 is equivalent to AWS:EZNI-CI

Description: Pure nickel welding core, cast iron electrode with strong reducing and strong graphitization, the weldment can not be preheated when welding, with good crack resistance and processing performance, AC and DC dual-use, good process performance. High toughness, high wear resistance, erosion wear resistance, etc.

Good weldability. Resistant to rock sand abrasive grain wear, prolong the service life of the equipment by 4-8 times.

Uses: It is used for repair welding of thin cast iron parts and machined surfaces, such as cylinder heads, engine seats, gearboxes and machine tool guide rails and other important gray iron castings. Nickel** is expensive and should only be used when other electrodes do not meet the requirements.

Deposition metal chemical composition %

c≤2 si≤ mn≤1 fe≤8 ni≥90

Z408 cast iron electrode.

Model GB: Eznife-1 is equivalent to AWS: ENIFE-CI

Description: Nickel-iron alloy welding core, strong reducing and strong graphitization cast iron electrode, with high strength, good plasticity, low line expansion coefficient and other characteristics. The crack resistance is similar to that of Z308 for grey cast iron, but is better than Z30 for ductile iron

8 strong, also has a good effect on cast iron with high phosphorus content. The cutting performance is slightly worse than that of Z308 and Z508, and it is used for the welding of gray cast iron and ductile iron at room temperature or slightly preheated (to about 200), AC and DC dual-use, stable arc and good manufacturability.

Uses: It is used for the welding and repair of important high-strength gray cast iron and ductile iron, such as cylinders, engines, seat gears, etc.

Deposition metal chemical composition %

C 2 Si mn Fe Ni 45-60

Question: Can cast steel and steel plate be welded, and what welding tone is used.

Scratch your head] scratch your head].

Answer: Cast steel can be divided into low carbon steel, medium carbon steel, etc., the composition is different, the welding rod used is also different, if it is a low carbon steel composition, choose ordinary welding rod, such as E4303 (J422) can be; If it is a medium carbon steel component, high-strength structural steel electrodes should be selected, such as E5015 (J507), E5515 (J557), etc., and the weldments should be preheated during welding to prevent cracks.

Selection of welding rods for steel castings.

The selection of steel casting electrodes is very strict, and the repair welding of steel castings can be selected according to the strength of the casting, working conditions and use performance, as well as the structure and defect parts of the casting. In production, welding rods are generally selected according to the following principles.

1. Select the welding rod according to the mechanical properties and chemical composition of the casting, and the welding rod with similar strength to the casting can be selected, when the weldability of the casting is poor, the welding rod with slightly worse performance can be selected, but the mechanical properties of the weld must be guaranteed, so as not to affect the strength and rigidity of the casting.

2. According to the working conditions and use performance of the casting, the casting of the welding rod subject to bearing force and impact load should be selected, and the low hydrogen, titanium-calcium, manganese and iron oxide slag electrodes should be selected, so as to make the weld have sufficient strength, plasticity and toughness. For castings working under corrosive conditions, the appropriate grade of stainless steel electrode should be selected according to the characteristics of the working conditions, and the working temperature of the casting should be considered.

3. According to the casting structure, geometry and defect location, select the large castings with the shape and thick wall of the welding rod, in order to prevent cracks during welding, manganese slag or iron oxide slag electrodes with good crack resistance should be selected. If the position of the defect position of the casting causes the best operation position cannot be selected for welding, the titanium slag or titanium iron slag electrode suitable for space welding should be used. For welding some parts that are difficult to clean, acid electrodes with strong oxidation and low sensitivity to rust, oxide scale and oil should be selected to avoid porosity in the weld.

4. The selection of welding current The defects of steel castings are repaired by electric welding, and when the acid structural steel electrode is used for repair welding, the welding current increases according to the increase of the diameter of the welding rod. When using alkaline low-hydrogen electrodes, the welding current can be 90% of that of uniform acid electrodes, and short arc welding is used.

Which electrode is better for cast iron welding, see how the old welder's experiment is.

Medium hardness steel welding rod, suitable for the rolling part of the cast steel mold of automobile mold. Medium and high temperature impact wear resistant parts repair rolling parts.

Summary. Hello, glad to answer for you! A302 and A312 electrodes can be used for repair welding of cast stainless steel parts.

This type of electrode is usually used for stainless steel and dissimilar steel welding, and the effect will be better. However, it should be noted that the welding of stainless steel and iron is not usable with ordinary welding rods, which are not welded firmly and are prone to fall off.

Hello, glad to answer for you! A302 and A312 electrodes can be used for repair welding of cast stainless steel parts. This kind of electrode is usually used for the welding of stainless steel and dissimilar steel, and the effect will be better.

However, it should be noted that the welding of stainless steel and iron is not an ordinary electrode, and the welding is not firm, and the lead is easy to fall off.

In the process of welding, it is necessary to carry out proper pressurization work on the weldment in order to make the welding more firm. In general, the laughter of friends will make the sleepy collapse with a metal material with a lower melting point than Wang Yuan's base metal as the brazing metal, and before welding, the liquid brazing metal is poured on the base metal, and at the same time, the liquid brazing metal is filled in the joint gap.

Dear, hello, I am happy to serve you, the answer is as follows Steel castings and iron with cold welding weldingSteel castings and iron welding can be welded with wewelding600 alloy steel electrode, cold welding welding process welding can be wewelding600 special alloy steel electrode characteristics wewelding 600 alloy steel electrode (referred to as weodin 600 electrode) is a low heat output, suitable for all-round welding of special nickel-chromium alloy steel electrode, extremely versatile, high strength general base metal strength design, It has excellent welding process performance, stable arc, uniform and beautiful weld, excellent welding effect under the conditions of oil, water and rust, and can weld different steels.