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Knowledge of flat welding

Knowledge of flat welding

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  • Time of issue:2022-11-25 10:38
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(Summary description)For T-shaped joints, Angle joints and lap joints with small welding foot size, single-layer welding can be adopted, using straight line or oblique serrated, oblique ring strip method. When the size of the welding foot is large, multi-layer welding or multi-layer multi-pass welding is generally adopted. The first layer adopts the linear running bar method, and the other layers can adopt the oblique ring and sawtooth running bar. For multi-layer and multi-pass welding, the linear conveyor is generally used.

Knowledge of flat welding

(Summary description)For T-shaped joints, Angle joints and lap joints with small welding foot size, single-layer welding can be adopted, using straight line or oblique serrated, oblique ring strip method. When the size of the welding foot is large, multi-layer welding or multi-layer multi-pass welding is generally adopted. The first layer adopts the linear running bar method, and the other layers can adopt the oblique ring and sawtooth running bar. For multi-layer and multi-pass welding, the linear conveyor is generally used.

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2022-11-25 10:38
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Information

 

What is flat welding?  

 

Flat welding refers to the welding process in which the welding is in a horizontal position or with a small tilt Angle, the electrode is located on the workpiece and the welder looks down on the workpiece.  This welding position belongs to the welding position, the most easy to weld a position.  

 

What are the characteristics of flat welding?  

 

  • The molten electrode is easily entered into the molten pool by the blow action of the arc and its own power, forming a natural transition.  

 

  •  Molten slag and molten iron is not easy to flow, allowing the use of thicker electrode and larger current, can form a larger molten pool, in the molten pool of molten slag and liquid metal both react evenly, can produce good crystalline organization, because the liquid molten slag and metal is not easy to flow, it is easy to control the shape and size of the weld, so that it can achieve beautiful quality.  

 

  • Because of overlooking welding, the operation is simple, convenient for beginners to practice and master, welder operation is easy, not easy to fatigue.  

 

  • The maximum welding current can be used when the thickness of the weldment is allowed, so the working efficiency is high and the application is wide.  

 

  •  Molten slag and molten iron are easy to be mixed together and indistinguishable, or molten slag to form slag, pores and other defects.  

 

  • Due to the improper selection of welding specifications such as welding current and groove form, as well as the improper operation of the transportation method and Angle, it is easy to cause welding tumors and incomplete welding when welding the first layer of welding passage.  Therefore, double-sided welding is often used for butt weld flat welding, that is, after the welding of the front side, the welding root of the reverse side is slotted with a wind shovel or carbon arc gouger, and then the back weld is welded.  

 

  •  Single-side welding requirements of double-sided forming, the first layer is easy to produce uneven penetration, back forming bad phenomenon, the rest of the layers are easier to master.  

 

 

Key points of flat welding operation  

 

(1) Correct control of electrode Angle, so that slag and liquid metal separation, prevent slag front flow, as far as possible to use short arc welding.  

 

(2) For the flat welding joint of T shape, Angle connection and lap joint of different thickness, the Angle of the electrode should be adjusted properly when welding, so that the arc is biased to the thicker side of the workpiece, to ensure uniform heating on both sides.  For multi-layer and multi-pass welding, attention should be paid to welding levels and welding sequence.  

 

(3) Choose the appropriate transportation method.  

 

For the workpiece with thickness less than 6mm, the workpiece is generally welded without groove opening. The straight line transport method is adopted for the butt flat welding seam without groove opening, and the straight line transport method is also adopted for the reverse weld.  In order to ensure penetration, the current can be larger, and the speed of the strip will increase.  

 

For the butt flat welding of open groove can be used multi-layer welding or multi-layer multi-pass welding, the bottom welding using linear rod, electrode diameter and welding current are smaller.  For multi-layer welding, the other layers shall adopt straight, sawtooth or crescent-shaped rails according to the requirements.  The method of linear running bar is used in multi - layer multi - pass welding.  

 

For T-shaped joints, Angle joints and lap joints with small welding foot size, single-layer welding can be adopted, using straight line or oblique serrated, oblique ring strip method.  When the size of the welding foot is large, multi-layer welding or multi-layer multi-pass welding is generally adopted. The first layer adopts the linear running bar method, and the other layers can adopt the oblique ring and sawtooth running bar.  For multi-layer and multi-pass welding, the linear conveyor is generally used.  

 

For ship-shaped welds, in order to ensure root penetration, the operation points are similar to that of open-groove butt flat welding. 

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