Hand welding What angle should vertical welding be done from the bottom up

The position of the electrode. In order to make the two steel plates evenly heated, ensure the penetration depth and improve the work efficiency, the position and inclination angle of the welding rod should be paid attention to when the angle of the fillet vertical welding. When the thickness of the two steel plates to be welded is equal, the angle between the electrode and the two steel plates should be equal to the left and right, and the angle between the electrode and the center line of the weld should change its size according to the different plate thicknesses, and generally should be kept at 60°-80°.

Control of molten metal. The key to the operation of fillet vertical welding is how to control the molten metal, which requires concentration during welding, paying attention to the cooling of the metal, and the welding rod should swing rhythmically according to the cooling of the molten metal. In the process of fillet vertical welding, when the first welding wave is welded after the arc is initiated, the arc should be increased quickly; When the molten pool is seen to be instantly cooled into a dark red dot, the arc descends to the arc pit again, and the molten droplet is solidified at the weld wave 2 3 that has been formed in front, and then the arc is raised again.

If the previous molten droplet has not cooled to a certain extent, the electrode is lowered too quickly, which will cause the molten metal to flow down; When the electrode descends too slowly, it will cause poor fusion between the droplets. If the electrode is placed in the wrong position, the welding wave will be disjointed, affecting the aesthetics and welding quality of the weld.

Vertical welding is the angle of the electrode 60 to 80 degrees, from the bottom of the arc from the bottom of the weld to the direction of the direction of welding, in the welding process of the electrode left stone uniform swing, at both ends to pause a little to achieve the base metal and the molten iron fully fused.

It doesn't have to depend on your position, just solder according to your own technique, just weld well, don't care what angle.

When welding with electric welding, it can be welded from top to bottom or from bottom to top.

Electric welding does not require the direction of welding, only the specific welding process will be stipulated, therefore, the upper to lower welding can also be welded from the bottom to the top, and often appears in the welding method of vertical welding, in the welding process, the molten pool metal and the molten droplet have a downward tendency due to the action of gravity, and the weldment is separated, so it is easy to produce welding nodules.

There are two methods of vertical welding: one is to weld from the bottom up, which is called upward vertical welding; The other is from top to bottom welding, which is called downward vertical welding. At present, the most widely used in production is bottom-up welding, and this method is focused on in practice.

1. Essentials of upward vertical welding.

l) Welding rods with smaller diameters should be selected (10% and 15% smaller than flat butt welding) so that the molten pool is small in size, cooling and solidification is fast, which can reduce and prevent molten metal from flowing down.

2) Short arc welding is adopted, the arc length is not greater than the diameter of the welding rod, and the arc blowing force is used to support the molten pool, and the short arc operation is conducive to the transition of molten droplets.

3) The working angle of the electrode is 90°, and the forward inclination angle is -10 -30°, that is, the electrode is inclined to the opposite direction of the welding direction, so that the arc blowing force produces an upward thrust on the molten pool to prevent the molten metal from flowing down.

4) In order to facilitate the operation of the right hand and observe the weld pool, the welder's body should not be facing the weld, but slightly to the left.

2. Downward vertical welding method.

The downward vertical welding method is only suitable for the welding of thin plates and unimportant structures, because the downward vertical welding is more likely to fall than the upward vertical welding of molten metal and slag, and the weld is prone to defects such as slag inclusion and porosity. The downward vertical welding method is characterized by fast welding speed, shallow penetration depth, narrow melting width, not easy to burn through, beautiful weld forming, simple operation, but it needs to be practiced to master the operation skills. The main points of its operation are as follows:

l) The welding current should be moderate to ensure good fusion;

2) When welding, make the electrode perpendicular to the surface of the weldment and use the direct attack method to start the arc, and the transport rod adopts a large electrode forward inclination angle, about 30 40 °, and uses the arc blowing force to support the molten pool to prevent the molten pool from flowing down;

3) The linear transport strip method is used to avoid transverse swing as much as possible, but sometimes it can also be slightly transversely swung to facilitate the good fusion between both sides of the weld and the base metal. The downward vertical welding method is best to use a special electrode for downward vertical welding with a large slag viscosity. In addition to the use of AC welding power supply, ordinary DC arc welding power supply should be welded by DC reverse connection method.

Vertical welding refers to welding along the joint from top to bottom or from bottom to top. (generally bottom-up).

Burn from the bottom to the top, and the welding scar is pressed from the bottom to the top.

Dear, hello, your question has been received, the answers to the relevant questions are as follows: manual electrode arc welding plate parts should be welded when the thickness of the vertical upward welding plate is 12mm, 6 layers should be welded, two layers should be filled, one layer of cover, and four layers of welding should be OK 12mm thick plate welding depends on the technical requirements, such as the drawings are fully welded, then according to the drawings to open the groove, fill the bottom and fill the cover surface welding, welding can not have no fusion, cracks and other serious defects. 1.

The weld bead should not have slag inclusions, undercuts, porosity, unmelted, and unwelded through; 2.The welding specification should be reasonable, and the appearance of the weld should be beautiful; 3.The height of the weld should generally not be less than the thickness of the thin plate.

For steel plates with a plate thickness of less than 6, the weld angle height is equal to the plate thickness; 4.For steel plates with a plate thickness of more than 6 mm, the height of the weld angle is customarily 70% of the plate thickness, but generally not more than 15 mm.

When welding with electric welding, it can be welded from top to bottom or from bottom to top.

Electric welding does not require the direction of welding, only the specific welding process will be stipulated, therefore, the upper to lower welding can also be welded from the bottom to the top, and often appears in the welding method of vertical welding, in the welding process, the molten pool metal and the molten droplet have a downward tendency due to the action of gravity, and the weldment is separated, so it is easy to produce welding nodules.

Can vertical welding be welded from top to bottom? Let you have a comprehensive understanding of vertical welding, and read the knowledge.

This is the earth object is affected by gravity, so it is from the bottom up. It is basically one to two millimeters away from the weld.

Vertical welding of galvanized square pipes can be welded from top to bottom, and the method is very simple.

Regular welding is bottom-up welding, to ensure that there is enough penetration, as for how to weld beautifully, it basically depends on the technique.

If there are no special requirements, the welding is generally from the bottom to the top, because the liquid filler material in the welding area will flow down due to gravity, and it is difficult to control the welding if you weld from the top down. There are many welding techniques in the process of welding from bottom to top, the more commonly used is to walk in the shape of a half-moon, pause slightly at both ends, and the intermediate process can be slightly faster, which helps the weld to form well. Practice a lot, and that feeling will be there, good luck!

Vertical welding can be both upward and downward, and the effect of upward and downward welding is completely different.

The vertical downward welding speed is fast, the penetration depth is relatively shallow, the molten iron is not easy to control, and it is easy to generate defects such as slag inclusion, so it is generally only for unimportant welds. During welding, the electrode maintains a large angle (about 40-50°) with the level, and uses the arc blowing force to keep the molten iron from flowing;

When standing up and welding, the short arc welding is generally maintained, the arc blowing force is used to support the molten iron, a smaller current is used, and the current of 90-100A is selected for the general and specification welding rods. It can be swung in the shape of a crescent moon or a figure 8 to make it beautiful.

Vertical welding requires very skilled welding technology to do, and it is necessary to have enough understanding of the properties of welding rods, molten pools, molten iron, and base metals.

1. Maintain the correct electrode angle. 2.Choose a small diameter electrode, diameter or diameter 4Choose low-current welding, lower the arc, and use short-arc welding.

Positive zigzag rod method: This method of welding is that the end of the electrode is zigzag and moves forward continuously, and stops on both sides for a while.

In order to control the flow of molten metal and obtain the necessary weld width, the weld forming effect is excellent.

Crescent method: When welding, the end of the electrode makes a crescent-shaped left and right swing along the welding direction.

The speed of the swing is determined according to the position of the weld, the form of the joint, the width of the weld and the value of the welding current.

When vertical welding, when the first positioning welding, it is necessary to carry out anti-deformation positioning, the gap is small and large, the angle between the welding rod and the iron plate is about 60 degrees, the current is slightly larger when the root is welded, and the double-sided click method is used, which can withstand the detection of X-ray, and the single point is a bit outdated. The click technique must be fast arc tight, the arc is stable, the eyes must be accurate, and the spot welding must be accurate, so as to ensure that the first root welding is the best! The second pass left is the mask.

I'm talking about single-sided welding, double-sided forming board-to-board welding. I hope it helps you, they are all peers. Hehe.

Wipe the vertical welding position clean, focusing on grease, positioning solder slag and water.

To know the size of the weld angle to be welded, first burn a standard weld angle according to the size of the weld angle. Note: High-quality welds must be welded from the bottom up.

Start arc striking by the standard welding angle, pay attention not to exceed the weld pool when the welding wire swings left and right, the range formed by the full dissolution of the welding wire, pause on both sides when swinging left and right, and determine the length of time to see the welding angle, if the welding angle is too large, it is recommended to weld multiple times, generally the first time the small point is good to weld, if it is too large at one time, it is easy to not have enough thickness and ugly, easy to bulge on both sides. When swinging from side to side, be sure to control the rhythm and slowly weld up.

Methods of passing the positioning point: There are many kinds of two main stories for you here: one is the direct transition method, pay attention to the high requirements for personal mastery ability, when welding to the positioning point, directly swing and burn up, pay attention to the hand to be fast and do not stay in the middle, the natural transition is good, and the stay time on both sides depends on the personal mastery.

Note that because the transition is fast, the dissolution is impermeable to the positioning point, and it is easy to blow up and weld, so wear protective clothing. The second is the spot welding transition method, when welding to the positioning point, stop and swing left and right for 2 times as a back and forth, spot welding transition until the past positioning point, continue to weld.

At the end of welding, if there is a molten pool, it must be filled by spot welding.

If it is a radian climbing welding vertical welding, if the welding angle is required to be very small, it can be picked up directly without swinging, and the technical requirements are a bit high.

Vertical welding: Vertical welding refers to welding along the joint from top to bottom or from bottom to top. The welding position with a weld inclination angle of 90° (vertical upward) is called the vertical welding position. Welding that is carried out at a vertical welding position is called vertical welding.

Features: During vertical welding, the molten pool metal and molten droplets have a tendency to fall due to gravity, and they are separated from the weldment, so it is easy to produce welding nodules. However, due to the low melting point and strong fluidity of the slag, the molten pool metal and the slag are easy to separate, and it is not easy to produce slag inclusions.

However, due to the fact that the molten pool is partially separated from the protection of the slag, it is easy to generate porosity if the operation or the angle of the transport bar is improper.

The angle of the manual welding vertical welding electrode is 60-70 degrees, and the electrode can swing left and right, but it should be faster.

Vertical butt welding refers to the operation when the butt joint weldment is in the vertical welding position, the characteristics of vertical butt welding are that the molten iron and slag are easy to separate, but when the temperature of the molten pool is too high, the molten iron flows seriously, and it is easy to form defects such as welding nodules and undercuts.

1. Welding posture. There are three basic operating postures of vertical butt welding: squatting, sitting and standing.

2. Welding tong grip. There are two kinds of gripping methods for vertical welding tongs: forward grip and reverse grip, and the positive grip method is generally commonly used when welding.

In order to achieve full penetration in the direction of the thickness of the weldment, in order to achieve full penetration in the direction of the thickness of the weldment, the weldment should be welded by opening the V-shaped groove.

Now there are very few electric welding, either shipyards or installation companies can use it, a sentence or two can not be clear, buy a pack of cigarettes and let the master around you point out, plus usually practice more. It's not practical to talk on paper.

Vertical welding method tutorial of electric welding, detailed explanation of various welding techniques, instant knowledge.

Vertical welding is to weld at the vertical welding position, the vertical welding position is that the axis of the weld is perpendicular to or approximately perpendicular to the horizontal plane, and the bevel bisector is perpendicular to or approximately perpendicular to the horizontal plane. The characteristics of the vertical welding position are: the liquid metal and the slag fall due to gravity, so it is easy to separate, but when the temperature of the molten pool is too high, it is easy to form a welding nodule; It is easy to grasp the welding penetration, but it is easy to undercut, and the surface of the weld is uneven and not smooth; For vertical welding of T-joints, the root of the weld is easy to weld impermeable.

Ordinary electrode and wire.

Generally speaking, ordinary electrodes and wires are welded from bottom to top, and the temperature of the molten pool should not be too high when welding, and the welding current should be 10 15 smaller than that of flat welding. Try to use short arc welding, sometimes use arc welding to control the temperature of the molten pool, that is, only the arc is elongated and not extinguished when the arc is picked, so that the surface of the molten pool is always protected by the arc; Vertical welding, generally make the welding rod angle downward tilt 60 80o, arc pointing to the center of the weld pool, for the butt vertical welding without beveling, from bottom to top welding, can use straight line, zigzag, crescent and arc method, the butt vertical welding of the bevel, often use multi-layer or multi-layer multi-pass welding, the first layer often uses the arc method or a triangle with a small swing, crescent-shaped bar, the rest of the layers can choose to use zigzag or crescent-shaped bar, in order to prevent the undercut on both sides of the welding, the root is not welded through, The arc should stay properly on both sides of the welding and at the top corner of the groove.

Downward welding electrode and wire.

For downward welding electrodes and wires (self-shielding flux core downward welding wires), it is suitable for top-down welding. The welding rod that adopts downward welding has fiber type downward welding rod and low hydrogen type downward welding electrode, which can be dragged straight down from top to bottom when welding, does not swing, fast welding speed, beautiful forming, and can use larger welding current, so it can improve productivity by more than 30 compared with general welding electrode from bottom to top, and can save materials and electrical energy. Moreover, the arc blowing force and stiffness of the up-and-down welding in the process are strong, and it is easy to achieve ideal single-sided welding and double-sided forming during root welding (root welding), and the welding speed of the electrode is fast.

Commonly used welding rods (welding wires) are: J506X, J507X, J507GX, E6010, E7010, E8018, E71T8, etc.