Spot welding is a kind of welding technology with a long history, which is composed of welding parts assembled into a lap joint and pressed between two electrodes, and uses resistance heat to melt the base metal to form a welding spot.
The welding parts are connected by a small molten core, which should be evenly and symmetrically distributed on the bonding surface of the two welds, and has the technical characteristics of welding under high current, short time and pressure.
Spot welding is a heat-mechanical (force) joint action of the welding process, according to the form of power supply can be divided into single-side welding and double-side welding, can be welded in a short time, so high efficiency. The heat is concentrated in a certain part, the welded material rarely occurs thermal deformation, and the welding quality is good. Because it is automatic welding, anyone can weld, and no skilled operation is required.
The rationality of welding spot arrangement of medium frequency spot welding machine: Spot welding welding structure is usually made of multiple connections, its arrangement is mostly single row, sometimes can also be multi-row, in a single row spot welding joint in addition to the shear stress, but also bear tensile stress caused by eccentric force, in a multi-row spot welding joint, tensile stress is small, research shows that the number of solder joints more than 3 is unreasonable, because more than 3 rows can not increase the bearing capacity.
At the same time, it should also be noted that a single row of spot welded joints is impossible to achieve the strength of the joint and the base metal, only the use of multiple rows (3 rows) arranged solder joints, can improve the impact of the partial force torch, reduce the stress concentration coefficient, if the use of staggered row method, the situation will be better, in theory, you can get a spot welded joint with the strength of the base metal.
We may encounter the phenomenon of splashing when operating the mid-frequency spot welding machine, which can cause easy scratching of the base metal, contaminating the welding helmet’s protective goggles, and the frosted glass sheet of the filter and camera. So how can you prevent this from happening?
In the process of operation, the interface of the welding quickly melts in a short time, the heat of the metal increases instantaneously, the melted liquid is too late to cool, and the liquid is sprayed out of the molten core under the action of pressure, resulting in a splash.
There is a heat-producing publicity Q=I²RT, which shows that spatter is easy to occur when the heat is too high, so spatter can be controlled from the Angle of current and resistance; Current density: there is dirt on the surface of the workpiece or there is a gap between the workpiece. Electrode: Electrode cap asymmetry or wear current density increase spatter increase.
Early splash:
Weld cleaning is not qualified, the pressure distribution on the contact surface is seriously uneven, resulting in early melting caused by high local current density, at this time due to the absence of plastic protection will inevitably occur splashing phenomenon.
Late splash:
The melting core grows and transition, beyond the effective range of electrode pressure, so as to break through the plastic ring in the radial cause of internal splashing, causing external splashing on the axial break surface, this situation is generally produced in the current is large, the power time is too long, can be shortened the power time and reduce the current method to prevent.
Suzhou Agera Automation Equipment Co., Ltd. is engaged in automatic assembly, welding, testing equipment and production line development enterprises, mainly used in home appliance hardware, automobile manufacturing, sheet metal, 3C electronics industry. According to customer needs, we can develop and customize various requirements of welding machines and automatic welding equipment and assembly welding production lines, production lines, etc., to provide suitable automated overall solutions for enterprise transformation and upgrading, and help enterprises quickly realize the transformation and upgrading services from traditional production methods to high-end production methods. If you are interested in our automation equipment and production lines, please contact us: leo@agerawelder.com
Post time: Apr-07-2024
