- Different Types Of Welding Processes--The Ultimate Guide2018-04-02
Different Types Of Welding ProcessesThe Ultimate GuideWelding is the process of coalescing materials such as metals or thermoplastics in order to seamlessly join them. The welding process involves applying heat and pressure to the materials being joined, in addition to a filler material, in order to create a weld pool which cools to form a strong joint.
Even though the process of welding itself has greatly evolved with the advent of new technology, it is important that we understand the differences between all the existing welding techniques in order to make an educated decision when it comes to picking the right technique for the job as well as hiring someone who knows what they’re doing. In this post, we will break down all the different types of welding and explain each one.Arc WeldingArc welding involves the use of a power supply and electrodes in order to form a welding arc between the electrode and the material being welded (usually metal), in order to melt the materials, allowing them to cool and fuse together. This method is probably the most popular type of welding process since it includes many of the most popular types of welding, such as MIG, TIG, and Stick welding. Arc welding is divided into consumable and non-consumable electrode methods.Consumable Electrode MethodsStick Welding (Shielded Metal Arc Welding or SMAW)
Although mostly considered archaic nowadays, especially when compared to the TIG and MIG, shielded metal arc welding, or stick welding, is a manual welding technique that relies on a consumable electrode coated in flux that is then used to lay the weld. This process is called stick welding because it uses welding sticks or rods that are made up of filler material and flux, the flux is used to protect the molten metal of the weld and the filler is then used to join two pieces of metal together.
Stick welding offers a very low-cost welding solution that requires minimal equipment. However, the quality of the final weld is not always the best as it can suffer from porosity, shallow penetration, cracking and it is highly vulnerable to severe weather and is generally less durable. Despite the fact that stick welding is a very old technique, it is still quite popular, especially in third world countries where expensive or new equipment is usually not widely available. Some of the fields that still rely on stick welding include refrigeration, plumbing, automotive and construction.
Further Readinghttp://www.gowelding.org/welding/stick-smaw/MIG Welding (Gas Metal Arc Welding or GMAW)
MIG welding is the second most popular welding technique used today. MIG stands for Metal Inert Gas Welding and it boils down to the concept of combining two pieces of metal together with a wire that is connected to an electrode current. The wire then passes through the welding stick which is shielded by an inert gas.
Some of the advantages that MIG welding offers over the other welding techniques include ease of use and the lower degree of precision that is required by the operator in order to obtain decent welds. However, MIG welding usually ends up being a bit more sensitive to external factors like wind, rain and dust and generally more settings like voltage and wire speed need to be finely tuned by the operator. The two most common quality problems associated with Metal Inert Gas Welding are dross and porosity. If these are not taken care of properly, welds might end up being structurally weaker than their TIG counterparts.
MIG ends up being much easier to master for operators as it is quite simple because the electrode is being automatically fed through the torch. Unlike TIG welding where both hands are used, in MIG the operator guides the welding gun across the area being welded.
MIG welding is most commonly used in automotive repair as it is capable of providing a strong, sturdy weld that when done correctly is able to withstand large forces, providing the level of versatility and strength that is needed fo
- Characteristics of electric welding machine2017-09-28
A welding machine has the advantages of the use of electric energy of electric welder, the electric moment is converted to heat, electricity is very common, suitable for work in the dry environment of electric welding machine, do not need too much, because of small size, simple operation, convenient use, fast speed, strong welding etc. widely used in various fields, special requirements for high strength parts special utility, you can instantly be the same metal material (can also be dissimilar materials, just different welding methods) permanent connection, weld after heat treatment, and the parent material of equal strength, good sealing, the manufacture of gas and liquid to the storage container solves the sealing and the problem of strength.
Two, electric welding machine welding machine around the disadvantages: in the process of using the machine will produce a certain magnetic field, the arc burning will produce radiation, infrared ultraviolet light arc, etc., and metal vapor and soot and other harmful substances, so the operation must do enough protective measures. Welding is not suitable for high carbon steel welding, due to the welding seam metal crystallization and segregation and oxidation process, for high carbon steel, poor welding performance, easy to crack after welding, heat crack and cold crack. Low carbon steel has good welding performance, but also in the process to operate properly, rust cleaning is trivial, and sometimes there will be weld slag crack porosity undercut defects, but the proper operation will reduce defects.
- Note before use of electric welding machine2017-09-26
The insulation resistance of the winding, the winding and the casing is greatly reduced, and the short circuit and grounding are easy to occur in the beginning of the use of the electric welding machine, which is easy to cause the equipment and personal accident. So before using the shake table to check whether the insulation resistance is qualified.
Before starting the new electric welding machine, should check whether the parts of the electrical system contactor is good, that is normal, can start trial operation in no load. Prove no electrical hazards, can be used in the load test run, and finally put into the normal operation.
DC electric welding machine shall be in accordance with the provisions of the direction of rotation, with the fan should pay attention to the fan rotation direction is correct, should be used by the top blow out. In order to achieve the purpose of cooling electric welding machine
1, should be based on the technical conditions of the workpiece, the use of reasonable welding process (welding electrodes, welding current and temporary load rate), does not allow the use of overload, and should be used as far as possible without power outage. Large current is not allowed to be used for welding, and the welding machine is not allowed to be used for metal cutting operation.
2, in the load welding, welding machine temperature should not exceed a class a B, 80C level 60C, or should be shut down after cooling, and then welding.
3, electric welding machine working site should be kept dry, well ventilated. Mobile electric welding machine, should be cut off the power, not to use the method of pulling the cable to move the welding machine, such as welding in a sudden power cut, should be cut off the power supply.
4, in welding, no regulating current, must use the handle to adjust the welding current, not too fast too fast, so as not to damage the regulator.
5, DC welding machine, should check the direction of rotation of the rotor to meet the direction of the direction of the welding machine logo.
6, DC welder brush frame edge and the surface of the commutator clearance shall not be less than 2-3MM, and often adjust and wipe the dirt.
7, silicon rectifier welder, must first open the fan motor, voltage meter indication should be normal, should carefully listen to abnormal sound. After shutdown, should clean silicon rectifier and other components.
8, it is prohibited to use shake table test of the main transformer of the silicon rectifier transformer secondary coil and control of the secondary coil of the transformer.
9, must be in the wet welding, the welder should stand on the insulation board, welding wire are not allowed to touch by hand, no arm clamping charged electrode holder, so as to avoid the electric shock.
- Earth film welding machine2017-09-25Geomembrane welding machine welding geomembrane, waterproof board, drainage board machine, design, numerical integration of automatic crawl, the operation is very simple, according to the different roller wheel type and can be divided into two types according to the steel wheel, lap width is different, can be divided into 10 cm and 15 cm two. Wheel type geomembrane welding machine is generally used for welding thickness of geomembrane under 1mm, steel wheel type geomembrane welding machine is generally used for welding thickness of geomembrane above 1mm, because the steel wheel type geomembrane welding machine in welding can also strengthen the embossing process, welding strength. Therefore, the thicker soil membrane, the need to use steel wheel type of soil membrane welding machine. At present, the price of the welding machine is generally between 3500-4500 yuan, we can choose according to their own needs to buy.
- Advantages of pulsed gas shielded arc welding2017-09-22
1 welding without splash, saving material; no need to clear slag, saving labor cost; surface forming
2 to achieve full position welding: pulse gas protection by electromagnetic force to achieve the transfer of the droplet transfer, basically not affected by gravity, so it can be a good way to achieve full position welding
3 to reduce the incidence of porosity: to prevent the generation of air holes, the requirements of higher gas purity, welding parameters, the mother and the welding wire clean. Pulse gas shielded welding in the same conditions can significantly reduce the incidence of porosity, does not increase the auxiliary equipment, easy to use.
4 thinning of the weld grain: pulse welding, the pulse frequency of the change of the molten pool of the stirring effect, to refine the metal grain size, grain refinement helps to improve the mechanical properties of welded joints.
5 reduces the crack sensitivity: the general welding metal grain is bigger, the solidification is easy to produce the crack. The grain size of metal can be reduced by pulse gas shielded arc welding, the more difficult it is, the more difficult it is to crack when the grain size is smaller.
6: the impact of deep penetration due to the peak current, the penetration depth is larger than that of ordinary gas welding, even at a small current can also achieve high penetration, which can ensure welding without welding wear.
7 double pulse welding is an advanced Pulse GMAW, based on pulse gas on the superposition of a pulse welding without welding swing can ripple effects of the beautiful, also can adapt to this kind of welding welding irregular groove, can also achieve good fusion in low input energy.