How to weld the waterproof copper strip

A 50 watt electric soldering iron with internal heating, rosin solder wire, fine sandpaper, and pointed pliers are sufficient. Remove the oxide layer on the surface of the water stop copper strip with sandpaper until it becomes bright. Heat each water stop copper strip with an electric soldering iron and tin it separately. Then, overlap the two copper sheets and use an electric soldering iron to heat and dissolve them.

Welding process test of water stop copper strip

The inspection of the welded joint of the waterstop copper strip does not require it to be made into a bull nose shape, and two pieces can be welded on both sides directly. When designing a water stop copper strip, the test piece should be sent for inspection according to the design irregular shape according to the requirements of the on-site supervisor. When there are no requirements from the on-site supervisor, the general method of sending specimens for inspection can be followed.

Here, a brief introduction is given to the welding process and testing methods of water stop copper strips:

1. The connection of the water stop copper strip adopts double-sided lap welding, with a lap length of no less than 20mm. The welding should be carried out using brass welding rod gas welding, and manual arc welding should not be used.

2. Welding operation conditions: 1) Welders should undergo training and assessment, be certified to work, and be familiar with mechanical performance and operating procedures. 2) All gas welding equipment must be inspected before work or when work is stopped for a long period of time. The joints and valve fasteners of acetylene cylinders, oxygen cylinders, and rubber hoses should be securely fastened without any looseness, damage, or leakage. Oxygen cylinders and their accessories, rubber hoses, and tools should not be contaminated with grease or dirt, ensuring that accidents do not occur during gas welding due to equipment failures. 3) Check for air leakage in gas welding equipment, accessories, and pipelines, and only use soapy water for testing. During the experiment, there should be no open flames or smoking around to avoid causing a fire. 4) The distance between oxygen cylinders, acetylene cylinders, and open flames should be at least 10 meters. If conditions permit, it is not allowed to be below 5 meters and isolation measures should be taken.

3. The welding method involves using oxygen and acetylene to generate high temperatures, melting the welding rod and solidifying the metal of the workpiece to form a weld seam.

4. In order to obtain high-quality welding joints, the shape and size of the welding pool should always be consistent.

5. The testing methods and results should be checked one by one in accordance with the relevant provisions of GB/T528, and there should be no bubbles, slag inclusions, or false welding. If necessary, strength inspection should be carried out, and the tensile strength should not be lower than 75% of the base material strength. The welded joint should have a smooth surface, no holes, gaps, and no water seepage.

Welding of copper waterstop

Testing method for welding quality of copper waterstop strips and waterstops

1. The welded joint of copper waterstop can be inspected for appearance quality

After welding is completed, visually or quantitatively inspect whether the weld seam is flat and smooth, whether the interface error of the axis time meets the technical requirements of the bidding documents, and whether the lap length is not less than 20mm.

2. Kerosene penetration test at the welding joint location

First, clean the surface of the parts used for inspection, without leaving any stains. Apply white powder slurry, and after thoroughly drying, apply kerosene on the back of the weld seam. Due to the tension effect of kerosene, it has the characteristic of penetrating small gaps. If the weld seam of the copper waterstop is not tight or there are looseness, interlayers, or dust inclusions inside the steel, kerosene will leak the copper waterstop onto the other side of the steel or weld seam and show stains on the white powder.

To accurately determine the location of defects and avoid the spread of stains, observe after applying kerosene for a moment. The initial location of the stain is the defect location. It is appropriate to ensure that the kerosene has sufficient infiltration time to ensure that the testing process lasts for more than half an hour without any stains.

3. Testing methods for mechanical properties of welded joints

The tensile strength test of the joint should not be less than 80% of the tensile strength of the base material, and this area needs to be strictly controlled by everyone.

How to solder copper sheets to copper sheets

Before using a new soldering iron, use fine sandpaper to polish the soldering iron tip, heat it with electricity, dip it in rosin, and then contact the soldering wire with the edge of the soldering iron tip to evenly coat the soldering iron tip with a layer of tin. This can facilitate welding and prevent surface oxidation of the soldering iron head. If the old soldering iron tip is severely oxidized and turns black, the surface oxide can be removed with a steel file to expose its metallic luster, and then re tinned before use.

The electric soldering iron should be powered by a 220V AC power supply, and special attention should be paid to safety when using it. The following points should be taken seriously:

It is best to use a three pole plug for the soldering iron plug. Ensure proper grounding of the casing.

Before use, carefully check the power plug and power cord for damage. And check if the soldering iron head is loose.

When using an electric soldering iron, do not use force to strike it. To prevent falling. When there is too much solder on the soldering iron head, it can be wiped off with a cloth. Do not throw it randomly to prevent scalding others.

During the welding process, the soldering iron should not be placed randomly. When not soldering, it should be placed on the soldering iron holder. Be careful not to place the power cord on the soldering iron head to prevent accidents caused by scalding the insulation layer.

After use, the power should be cut off in a timely manner and the power plug should be unplugged. After cooling, retrieve the soldering iron from the toolbox.

2. Solder and flux

When welding, solder and flux are also required.

(1) Soldering: Soldering electronic components, usually using solder wire with rosin core. This type of soldering wire has a low melting point and contains rosin flux, making it extremely convenient to use.

(2) Flux: The commonly used flux is rosin or rosin perfume (dissolved in alcohol). Using flux can help remove oxides from the metal surface, facilitate welding, and protect the soldering iron tip. When welding larger components or wires, solder paste can also be used. But it has a certain degree of corrosiveness, and residues should be promptly removed after welding.

3. Auxiliary tools

For the convenience of welding operations, pointed nose pliers, offset pliers, tweezers, and small knives are often used as auxiliary tools. You should learn to use these tools correctly.

2、 Pre weld treatment

Before welding, the soldering area of component pins or circuit boards should be treated before welding.

1. Remove the oxide layer from the welding area

A small knife can be made from a broken saw blade. Scrape off the oxide layer on the surface of the metal lead to expose the metallic luster of the pin. Printed circuit boards can be polished with fine gauze paper and coated with a layer of rosin alcohol solution.

2. Tin plating of components

Tin the scraped leads. After dipping the lead in rosin alcohol solution, press the hot soldering iron tip with tin onto the lead and rotate it. This can evenly coat the leads with a thin layer of tin. Before welding the wire, the insulation skin should be peeled off and then subjected to the above two treatments before it can be officially welded. If the wire is made of multiple strands of metal wire, it should be twisted together before tin plating after polishing.

Article source: Internet

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