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Influence of Extrusion Force of Second-hand Industrial Welded Pipe Unit on Welding Quality

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  • Release time:2021-09-02 11:30
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【概要描述】The extrusion volume of the second-hand industrial welded pipe unit is the extrusion volume of the metal at the weld seam position when the edge of the tube blank is heated by high-frequency heating and passes through the squeeze roller. A simple and accurate measurement of the amount of extrusion is the difference between the length of the circumference before and after welding.

Influence of Extrusion Force of Second-hand Industrial Welded Pipe Unit on Welding Quality

【概要描述】The extrusion volume of the second-hand industrial welded pipe unit is the extrusion volume of the metal at the weld seam position when the edge of the tube blank is heated by high-frequency heating and passes through the squeeze roller. A simple and accurate measurement of the amount of extrusion is the difference between the length of the circumference before and after welding.

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  • Source:
  • Release time:2021-09-02 11:30
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Detail

The extrusion volume of the second-hand industrial welded pipe unit is the extrusion volume of the metal at the weld seam position when the edge of the tube blank is heated by high-frequency heating and passes through the squeeze roller. A simple and accurate measurement of the amount of extrusion is the difference between the length of the circumference before and after welding.

 

The amount of extrusion is the same as the input heat, which is one of the most important factors affecting the welding quality of the second-hand industrial welded pipe unit. A moderate amount of squeezing can expand the contact surface of the metal to be welded, so that sufficient metal particles can produce interaction between the crystals, which affects the size of the welding pressure, the size of the rising angle of the metal streamline, and then the welding strength.

 

second-hand industrial welded pipe unit

 

When the extrusion amount is small, the allowable heat input range is narrow, the heat-affected zone width is large, the metal streamline rise angle is small, the welding quality is unstable, and it is very easy to cause undercuts, impurities (black overburned oxide), Welding defects such as pre-arc (white overfired oxide) and insufficient fusion. Appropriately expanding the amount of extrusion narrows the range of allowable heat input, reduces the width of the heat-affected zone, expands the rising angle of the metal streamline, and improves the welding quality. However, excessive extrusion not only reduces the welding strength, but also increases the amount of internal and external burrs, which makes the edge surface metal material with higher plasticity squeeze the weld, resulting in difficulty in elimination, and the low temperature of the metal particles on the fusion line causes the molecules to diffuse The weakening of the capacity affects the solid-phase recrystallization process and is very easy to cause lap welding defects.

 

As shown in the figure below, the width of the heat-affected zone and the width of the fusion line during the production process of the second-hand industrial welded pipe unit will decrease with the increase in the amount of extrusion under the condition that the input heat remains unchanged. In addition, the range of allowable heat input decreases as the amount of extrusion decreases, and expands as the amount of extrusion increases. When the extrusion amount is less than 0.5mm, the allowable heat input range is very narrow; when the extrusion amount is 1.5mm, the allowable heat input range is wider, and when the extrusion amount exceeds 2.0mm, the allowable heat input range is mainly improved. It's not significant.

 

second-hand industrial welded pipe unit

 

Therefore, in the actual production of second-hand industrial welded pipe units, the amount of extrusion should take into account the element of wall thickness, and it is appropriate to control it at 2.0~3.0mm. For thick-walled pipes, such as welded pipes above 8mm, the extrusion amount can be appropriately increased by 1~2mm. When the strength of the welded pipe is high, the extrusion amount should also be appropriately increased. Based on experience, the extrusion amount is usually 40%~50% of the wall thickness calculate.

 

 second-hand industrial welded pipe unit

 

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