To weld well, the control of the molten pool is something you must learn!

Molten pool temperature, directly affect the welding quality, molten pool temperature is high, molten pool is larger, hot iron flow is good, easy to fuse, but too high, hot iron easy to drip, single-sided welding double-sided formation of the back easy to burn through, forming welding tumor, forming is difficult to control, and joint plastic drop, bending easy cracking. When the molten pool temperature is low, the molten pool is small, the molten iron is dark, the fluidity is poor, and it is easy to produce defects such as incomplete welding, incomplete fusion and slag inclusion. The bath temperature is closely related to the welding current, electrode diameter, electrode Angle, arc burning time, etc. The following measures are taken to control the bath temperature according to the relevant factors. 1. Welding current and electrode diameter: According to the space position of the weld, welding level to choose the welding current and welding rod diameter, welding, welding current and welding rod diameter, vertical, horizontal position is small. Such as 12mm flat butt welding of the bottom layer of the use of φ3.2mm electrode, welding current: 80-85A; Fill, cover layer using φ4.0mm electrode, welding current: 165-175A; Reasonable selection of welding current and electrode diameter, easy to control the bath temperature, is the basis of weld forming. 2. Transport method: The temperature of the molten pool of the circular strip is higher than that of the crescent strip, and that of the crescent strip is higher than that of the sawtooth strip. In the bottom layer of 12mm flat welding seal, the sawtooth strip is used. And the swing amplitude and the pause on both sides of the groove, effectively control the molten pool temperature, so that the size of the weld hole is basically the same, the root of the groove did not form welding tumor and burn through the probability has decreased, the penetration has improved, so that the plate butt flat welding of single-side welding double-sided forming is no longer difficult. 3, welding rod Angle: When the Angle between the electrode and the welding direction is 90 degrees, the arc is concentrated, the molten pool temperature is high, the Angle is small, the arc is dispersed, the molten pool temperature is low, such as 12mm flat welding seal bottom; Electrode Angle: 50-70 degrees, so that the molten pool temperature has been reduced, to avoid welding tumors or high back. Another example, in the 12mm plate vertical welding seal bottom for electrode, the joint using 90-95 degrees of welding Angle, so that the temperature of the molten pool can be rapidly increased, the hole can be opened smoothly, the back forming more flat, effectively control the phenomenon of concave joint point. 4, arc burning time, φ57×3.5 pipe horizontal fixed and vertical fixed welding practice teaching, arc breaking method welding; The frequency of arc breaking and the time of arc burning directly affect the temperature of molten pool. Due to the thin tube wall, the arc heat bearing capacity is limited, if the arc breaking frequency is slowed down to reduce the molten pool temperature, it is easy to produce shrinkage cavity, so the arc burning time can only be used to control the molten pool temperature. If the molten pool temperature is too high and the molten hole is large, the arc burning time can be reduced to reduce the molten pool temperature. At this time, the molten hole becomes smaller and the tube internal forming height is moderate, so as to avoid the ultra high welding seam or welding tumor in the tube.铜焊丝,Copper Welding Rods,铝焊丝,aluminium welding wire,镍焊条,Nickel electrode,药皮焊条,Flux Coated Brazing Welding Rods