Keywords: SPA-H steel welding, SPA-H steel plate, SPA-H steel sheet, weathering steel sheet, SPA-H steel specification
The technicians of the
SPA-H weathering steel sheet processing factory found that the temperature of the molten pool is closely related to the welding current, the diameter of the SPA-H steel plate, the angle of the SPA-H steel sheet, and the arc burning time. According to the relevant factors, the following measures were taken to control the temperature of the molten pool. Welcome to send email to
[email protected] if you are interested in our SPA-H steel stock.
1. Welding current and diameter of
SPA-H steel plate: Welding current and diameter of wear-resistant SPA-H plate are selected according to the spatial position and welding level of the weld. When welding, the welding current and wear-resistant SPA-H are selected. The weathering steel plate has a relatively large diameter and a small vertical and horizontal position. For example, the sealing layer of 12mm flat butt flat welding uses φ3.2mm wear-resistant SPA-H steel welding current: 80-85A, filling, and the cover layer uses φ4.0mm SPA-H weathering steel plate welding current: 165-175A , Reasonable selection of welding current and wear-resistant SPA-H plate diameter, so that it is easy to control the temperature of the molten pool, is the basis of weld formation.
2. The method of transporting the strip, the temperature of the molten pool of the circular strip is higher than the temperature of the crescent strip, and the temperature of the crescent strip is higher than the temperature of the pool of the zigzag strip. The zigzag stripe, and the amplitude of the swing and the stops on both sides of the groove effectively control the temperature of the molten pool, so that the size of the molten hole is basically the same, there is no chance of a weld knob and burn through at the root of the groove Decreased, the unwelded penetration has improved, so that the single-sided welding and double-sided forming of the flat butt welding of the board is no longer a difficult point.
3. SPA-H steel plate angle, SPA-H weathering steel plate, cast iron core, SPA-H steel plate and welding direction at an angle of 90 degrees, the arc is concentrated, the temperature of the molten pool is high, the angle is small, the arc is scattered, the molten pool Low temperature, such as 12mm flat welded seal bottom layer, wear-resistant SPA-H weather-resistant steel plate angle: 50-70 degrees, which reduces the temperature of the molten pool, avoiding the occurrence of welding knobs or rising on the back. For another example, after replacing the SPA-H weather-resistant steel plate with the cast iron core SPA-H weather-resistant steel plate at the bottom of the 12mm plate vertical welding seal, the angle of the SPA-H plates at 90-95 degrees is used at the joint, so that the temperature of the molten pool is rapidly increased, The hole can be opened smoothly, and the back surface is relatively flat, which effectively controls the phenomenon that the joint point is concave.
4. Arc burning time, in the practice teaching of horizontal fixed and vertical fixed welding of φ57 × 3.5 pipe, the arc breaking welding method is used. When sealing the bottom layer, the frequency of arc breaking and the arc burning time directly affect the temperature of the molten pool. The tube wall is thin and the heat capacity of the arc is limited. If you slow down the frequency of the arc to reduce the temperature of the molten pool, it is easy to cause shrinkage. Therefore, you can only use the arc burning time to control the temperature of the molten pool. When the weld hole is large, the arc burning time can be reduced to reduce the temperature of the molten pool. At this time, the weld hole becomes smaller and the internal forming height of the pipe is moderate. Super high or generate welding bumps.
