Which Solder Can Weld Titanium Alloys?

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Eutectic solder can weld titanium alloys. The melting point of eutectic solder is 183 degrees. When the content of tin is higher than 63%, the melting temperature increases and the strength decreases. When the content of tin is less than 10%, the welding strength is poor, the joint becomes brittle, and the lubricating ability of the solder becomes poor.

titanium alloy weld picture
The most ideal is eutectic solder. At the eutectic temperature, the solder changes from solid to liquid directly without going through a semi-liquid state. The melting temperature of eutectic solder is lower than that of non-eutectic solder, which reduces the number of components to be soldered. At the same time, because the eutectic solder is directly changed from liquid to solid, it also reduces the phenomenon of virtual soldering, so the eutectic solder is widely used.

Little knowledge of sintering furnace: the difference between titanium carbide and tungsten carbide

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Silicon carbide has two commonly used basic varieties, black silicon carbide and green silicon carbide, both of which belong to α-SiC.

①Black silicon carbide contains about 95% SiC, and its toughness is higher than that of green silicon carbide. It is mostly used for processing materials with low tensile strength, such as glass, ceramics, stone, refractory materials, cast iron and non-ferrous metals.

②Green silicon carbide contains more than 97% SiC and has good self-sharpening properties.

Titanium carbide is only a component of tungsten steel. It also needs to use iron group metals (mainly cobalt) as a binder, mixed and pressure-formed, and titanium carbide alone cannot be used as a tool.

TiC is light gray, cubic crystal system, insoluble in water, has high chemical stability, hardly reacts with hydrochloric acid and sulfuric acid, but can be dissolved in aqua regia, nitric acid, and hydrofluoric acid, and is also soluble in alkaline in the oxide solution.

Tungsten carbide is a compound composed of tungsten and carbon with a molecular formula of WC and a molecular weight of 195.85. It is a black hexagonal crystal with a metallic luster, and its hardness is similar to that of a diamond. It is a good conductor of electricity and heat. Tungsten carbide is insoluble in water, hydrochloric acid and sulfuric acid, and is easily soluble in the mixed acid of nitric acid and hydrofluoric acid. Pure tungsten carbide is brittle, and if it is mixed with a small amount of titanium, cobalt and other metals, the brittleness can be reduced. Tungsten carbide used as a steel cutting tool is often added with titanium carbide, tantalum carbide or their mixture to improve the anti-knock ability. Tungsten carbide is chemically stable. Tungsten carbide powder is used in cemented carbide production materials.

Tungsten steel, also known as cemented carbide, refers to a sintered composite material containing at least one metal carbide. Tungsten carbide, cobalt carbide, niobium carbide, titanium carbide, and tantalum carbide are common components of tungsten steel. The grain size of the carbide component (or phase) is typically between 0.2-10 microns, and the carbide grains are held together using a metallic binder. The binder usually refers to the metal cobalt (Co), but for some special applications, nickel (Ni), iron (Fe), or other metals and alloys can also be used. A compositional combination of carbide and binder phase to be determined is referred to as a “grade”.

Do you know the role of titanium in plants?

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The research results show that titanium is a beneficial trace element, which can not only enhance the photosynthesis of plants, increase the chlorophyll content of leaves and the activity of catalase in plants, but also promote the absorption and operation of nitrogen, phosphorus and potassium by plants, thereby Play a role in increasing crop yield and improving fruit quality.

The role of titanium in plants

1. Increase the content of chlorophyll and carotenoids in the fresh weight of plant leaves by about 20%, increase the rate and effect of chlorophyll photosynthesis by 10-20%, and improve the ability of plants to produce nutrients through photosynthesis…

2. Improve the activity of nitrogenase, peroxidase, nitrate reductase and 2-6 phosphatase in plants.

3. It has a hormone-like effect, which is beneficial to the activation of DNA in the nucleus, and can mobilize endogenous hormones to transport to the growth center, promote differentiation and induce callus.

4. Increase the dry matter accumulation of plants.

5. Promote seed germination and crop root growth and development.

6. Increase the number of rhizobia on legume crops and improve the nitrogen fixation ability.

7. Promote the absorption and operation of nitrogen, phosphorus, potassium and other trace elements by plants, and improve the utilization rate of fertilizers.

8. Promote the early maturity of crops.

9. Improve the sugar content and vitamin C content of crops.

10. Improve the coloring degree and grade of fruit.

The effect of using titanium fertilizer

1. Greatly improve the intrinsic quality of crops and fruits. It is determined that the protein content of grain crops with titanium fertilizer is increased by 3-5%; the content of lysine is increased by 3-10%; the content of vitamin C in fruits is increased by 3-17%; the content of water-soluble sugar is increased by 4-15%; Organic minerals have been greatly improved.

2. Enhance the resistance of crops. Such as drought resistance, waterlogging resistance, cold resistance, high-temperature resistance, and disease resistance ability are greatly improved. We also found that: the plant is damaged by pesticides due to excessive or improper use, and it can be properly relieved by applying titanium fertilizer, so that it can recover quickly.

3. It can improve the absorption and utilization rate of fertilizers in the soil by plants. According to the current comprehensive scientific and technological level of agriculture in my country, the utilization rate of fertilization of agricultural crops in my country is only about 30%, while in countries with developed agriculture, the effective utilization rate of fertilization can reach more than 60%. After applying titanium fertilizer, the utilization rate of fertilizer in the soil by crops can be increased by 20%-30% on the original basis.

4. Significant increase in production. The test results of nearly 100 kinds of crops show that the growth rate of legume crops is more than 30%; the average yield increase rate of food crops is between 15-25%; the average yield increase of vegetables is 35-50%; In the case of fruits, due to the improvement of single fruit weight and coloring degree, and the increase of sugar content by 4-6 degrees, and the early maturity of 5-7 days, the grade of the product has been greatly improved, and the economic benefit is more significant.

Share the cleaning method of titanium rod filter

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Speaking of “titanium rod”, many people must not know or understand it, let alone where it is used. In fact, many of the instruments we see in our lives use mostly titanium materials. Tell the titanium powders about the cleaning method of the titanium rod filter.

After the titanium rod filter element is used for a period of time, it will cause a certain degree of blockage, which is manifested as a decrease in the flow rate and an increase in the pressure at the front end of the filter. For example, from below 0.22mPa to above 0.3mPa, we need to clean the filter element. The methods generally include the following:

1. When the filtration effect has not recovered significantly after multiple backwashing, use the hydrochloric acid solution below 5%, the sulfuric acid solution below 8%, or NaOH (sodium hydroxide) solution below 10% at room temperature. , and then rinse with clean water.

2. For the newly used filter element, generally use the method of clean water backflushing and gas backflushing to clean, that is to say, use clean water slightly larger than the working pressure (for example; 0.3mPa) to inject water in the opposite direction, and the backflushing time is about 1 ~3 minutes is enough.

Remember to pay attention to safety when operating!

There are several main points of nickel crystal counterfeiting in nickel pipe fittings

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1. With the current popularity of nickel crystals in nickel pipe fittings, unscrupulous merchants will use hair crystals or rough hair crystals to pretend to be nickel crystals. Many people have been confused about the difference between nickel crystals and hair crystals. In fact, the simple way to distinguish is hair crystals. Whether it is coarse hair or fine hair, as long as the hair in the crystal is like hair, it is a hair crystal. Only the nickel crystal plate in the crystal can be regarded as a nickel crystal in a real sense.

2. Nickel crystals also have a lot of color additions now. Generally, the nickel crystals and blond crystals are colored with a slightly brighter yellow color, and the crystals will appear yellow. If the color addition process is not good, if you look closely, the crystals will appear yellow. There may be a little yellow residual pigment in it. This is an ordinary color addition. The better color addition crystal is a white body (white crystal) and is still surrounded by the whole, without any leakage, but the color of the hair is bright. Huang, how to do it, I don’t know the specifics, but this kind of color addition is generally more on the blond crystal.

3. The nickel crystal two-in-one in the nickel pipe fitting is a good nickel crystal plate, but there is no meat on it (that is, the white crystal part is relatively small), the counterfeiter will find a good white crystal and a nickel crystal plate with no meat. Stick it into a whole nickel crystal. This also requires skill to work. The counterfeiter has to ensure that there is no dust in it when it is dipped. The counterfeiting skills are so high that there is no trace of sticking from the front and back at all. Only the side of the nickel crystal can be used. If you see a gap, in order to prevent others from discovering it, counterfeiters usually make two-in-one nickel crystals into edge-wrapped pendants and rings. Two-in-one nickel crystals are also better nickel crystal plates, and they will be used only if they are in good condition, and will not use low-grade nickel crystals for two-in-one.

4. There are many nickel crystal plates in nickel pipe fittings. Nickel crystals generally have nickel crystal roots, some are nickel crystal black roots with biotite, and some are nickel crystal roots without biotite, but most of the places with roots will have or There are more or less external leaks, some leaking large nickel crystals, and some unscrupulous merchants will use specific glue (it seems to be UV glue in the industry) to block the leaking place, and the color of the glue is white. It’s almost opaque, but you can still see it if you look closely.

Is 304 stainless steel a low carbon steel?

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If you want to know the answer to the question “Is 304 stainless steel a low carbon steel?”, let’s analyze it in terms of carbon content, type, and scope of use.

1. Carbon content.

The carbon content of 304 stainless steel is about 0.07%. And we often say that the carbon content of low carbon steel is between 0.10 and 0.25%. According to the content, 304 stainless steel is actually stainless steel with low carbon content in stainless steel.

2. Type difference.

304 stainless steel is a kind of austenitic stainless steel, and low carbon steel is carbon steel with very low carbon content, also known as mild steel. The two do not belong to the same category of steel.

3. Features are different.

304 stainless steel is only a common type of stainless steel among many stainless sheets of steel, but it has the characteristics of good corrosion resistance, heat resistance, punching and bending properties and high toughness; low carbon steel has low strength and hardness, plasticity, toughness and weldability. Okay.

4. Classification of uses.

304 stainless steel is widely used in hardware products, home decoration, food and medical treatment, mechanical equipment and other fields; while low carbon steel is widely used in engineering structural parts without heat treatment, such as chains, rivets, bolts, shafts, etc.

5. Other types of stainless steel with low carbon content.

There are other materials in stainless steel with low carbon content, less than 0.03%, such as 304L, 316L, 317L, 301L and other low carbon stainless steel.

Therefore, 304 stainless steel is only low in carbon content, it is stainless steel with low carbon content, not low carbon steel.

What are the requirements for stainless steel pipes for bathroom use?

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The stainless steel pipe installed in the bathroom will have some requirements on material selection, corrosion resistance, heat resistance, etc. So what are the quality requirements for these stainless steel pipes?

1. Selection of raw materials

According to the provisions of JG/T 427-2014, the stainless steel pipe materials should be 06Cr19Ni10 (S30408), 022Cr19Ni10 (S30403), 06Cr17Ni12Mo2 (S31608), 022Cr17Ni12Mo2 (S31603) specified in GB/T 20878.

2. Appearance of the product

The surface of the sanitary pipe should be free from pits, scratches, pores, burrs, sink marks, holes, cold insulation, sand holes, ripples, warping and other defects; the texture of the polished surface should be clear, consistent, and free of random lines; the color of the coating surface Uniform and consistent, no defects such as bubble sagging, falling off, paint buildup, orange peel, etc; Moreover, there should be no sharp corners, burrs, burrs and other appearance defects that may cause harm to the human body in the easily accessible parts of the human body.

3. Corrosion resistance

Most stainless steel pipes require good corrosion resistance. Due to the relatively humid environment, salt spray test will be used to observe whether the requirements are met.

4. Polishing performance

Stainless steel pipe for bathroom – handrail

Stainless steel pipes are generally polished during production. The surface of the product is clean and textured, which is very in line with the aesthetic needs of consumers. Polishing has requirements on material surface, material hardness, etc. If the surface of the material has scratches, pitting, over-pickling and other problems, it will affect the polishing performance of the product tube; the hardness of the material is too low, and it is not easy to polish when polishing, and the surface is prone to orange peel phenomenon during deep drawing, so the hardness of the material is high. , the polishing performance is relatively good.

The above are some of the requirements for stainless steel pipes for sanitary ware that Xiaobian has compiled for you. I hope it can be helpful to you. See you in the next issue!

How much is a kilogram of titanium alloy?

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Titanium was originally 300,000 tons, but due to excess production in China, it was about 40,000 tons, which is 20 per kilogram! Titanium is not very valuable, but there must be a huge disparity in the price of different types of titanium alloys. A titanium alloy screw-in Bugatti is worth $50, so the nuclear price is expensive! Titanium is also difficult to machine, so the finished parts are more expensive!


There are many kinds of titanium alloys, depending on which one you want. The reference price of TC4 alloy titanium rod: 100+ yuan/kg.
The price of titanium alloy material is related to alloy composition, processing method and mechanical properties.
The price of ordinary civilian titanium alloy plates, rods and wires is 150~280 yuan/kg.
The price of military titanium alloy is generally not less than 500 yuan. High to 1300 yuan / kg.
The ingredients are almost the same, but the price is very different. The reason is high performance and stable batch quality.

Learn about the classification of stainless steel sheets

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What are the classifications of stainless steel sheets? Today I will give you the answers one by one. Stainless steel plates are classified according to different standards: according to thickness: can be divided into thin plates (0.2mm-4mm), medium plates (4mm-20mm), thick plates (20mm-60mm), extra-thick plates (60-115mm) ). According to the production method, it can be divided into hot-rolled steel sheets (steel sheets heated and formed by a heating furnace) and cold-rolled steel sheets (steel sheets produced by cold rolling processes).

According to the classification, it can be divided into bridge steel plate, boiler steel plate, shipbuilding steel plate, armor steel plate, car steel plate, roofing steel plate, structural steel plate, electrical steel plate (silicon steel sheet), spring steel plate, solar panel (Hairui Special Steel). According to the arrangement and classification of steel, it can be divided into austenitic types (200 series, 300 series stainless steel).

Austenitic-ferritic type (both the characteristics of austenitic and ferritic stainless steel), ferritic type (409, 430, 434 series stainless steel), martensitic type (403, 410, 414, 416,). According to the classification of surface characteristics, it can be divided into silvery-white matt (no need for surface gloss).

Bright as a mirror (building materials, kitchen utensils), coarse grinding/intermediate grinding/fine grinding/very fine grinding (building materials, kitchen utensils), hairline grinding (buildings, building materials), close to mirroring grinding (art use, decoration used), mirror grinding (reflector, decorative).

Brief Analysis of Important Components in Titanium Pipes

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Let’s analyze the working conditions of titanium fittings: Titanium pipelines mainly transport corrosive and dangerous mediums. When the medium with corrosive medium passes through titanium pipe fittings, the medium has some pressure, and the bearing pressure of each pipe fitting is different. Three commonly used pipe fittings (elbow, tee, reducer) are analyzed:

1. Reducer:

The working condition of the reducer, when the medium passes through the reducer, the medium often flows from the large end to the small end. Due to the gradual reduction of the cross-sectional area, the taper part of the reducer is pressurized, and the inner surface of the cone has a higher bearing capacity. High pressure and severe erosion-corrosion.

2. Elbow:

Elbow is one of the important pipe fittings in each pipeline system. In addition to changing the flow direction of the medium, it also increases the flexibility of the pipeline. When the medium passes through the elbow, the medium with pressure goes straight to the back of the elbow, and the medium flows along the back to the outlet. It can be seen that the back of the elbow is subjected to both high pressure and severe erosion and corrosion, indicating that its back carries more than any other part.

Three, three links:

The working condition of the tee is similar to that of the elbow. When the medium passes through the tee, it rushes to the intersection of the branch of the tee and the straight. The bearing pressure and erosion-corrosion here are greater than other parts, and the branch is in the pressure relief and diversion state of the main pipeline.

The above analysis shows that titanium pipe fittings are very important components in titanium pipes, which directly affect the life of titanium pipe fittings.