How to manually feed the welding wire in argon arc welding, argon arc welding wire feeding technique

The welding wire is placed on the palm of the hand and clamped between the little finger and the ring finger.

In the middle, twist the wire with your thumb and forefinger and transport the wire back and forth from top to bottom.

It's similar to manual arc welding, but you have to hold it with your thumb and forefinger.

Manual argon arc welding wire is a straight welding wire with a specification length, if it is cut from the coil welding wire, it is best not to go too long, the operation is inconvenient.

It is impossible to finish it at one time, and the welding section should be extinguished and the position of the hand should be readjusted after the arc is raised.

Argon arc welding priming, electrode arc welding CO2 cover surface, referred to as argon electric welding.

It is to pass argon shielding gas around the arc welding to isolate the air from the welding area and prevent oxidation in the welding area.

Argon arc welding technology is based on the principle of ordinary arc welding, the use of argon to protect the metal welding consumables, through high current to make the welding consumables melt into a liquid state on the welded substrate to form a molten pool, so that the welded metal and the welding consumables to achieve metallurgical combination of a welding technology, because of the continuous delivery of argon in the high temperature melt welding, so that the welding consumables can not contact with the oxygen in the air, thereby preventing the oxidation of the welding consumables, so that stainless steel, iron hardware metals can be welded.

Extended information: The working principle of argon arc welding in the main circuit, auxiliary power supply, drive circuit, protection circuit, etc. is the same as that of hand arc welding. I will not go into more detail here, but focus on the unique control function and arc starting circuit function of argon arc welding machine.

The reason why TIG welding can be so widely used is mainly because of the following advantages.

1. Argon protection can isolate the adverse effects of oxygen, nitrogen, hydrogen and other gases in the air on the arc and molten pool, reduce the burning loss of alloying elements, and obtain dense, spatter-free and high-quality welded joints;

2. The arc of argon arc welding is stable, the heat is concentrated, the arc column temperature is high, the welding production efficiency is high, the heat affected zone is narrow, and the weldment stress, deformation and crack tendency of the weldment are small;

3. Argon arc welding is open arc welding, which is convenient for operation and observation;

4. The electrode loss is small, the arc length is easy to maintain, and there is no flux and coating layer during welding, so it is easy to realize mechanization and automation;

5. TIG welding can weld almost all metals, especially some refractory metals and easily oxidized metals, such as magnesium, titanium, molybdenum, zirconium, aluminum, etc. and their alloys;

6. It is not limited by the position of the weldment, and can be welded in all positions.

You know how much you weld, how do you say this, contact me to teach you.

1) Wire feeding: divided into internal and external wire filling.

The outer filler wire can be used for priming and filling, which is to use a larger current, the welding wire head is on the front of the groove, the left hand pinched the welding wire, and constantly sent to the molten pool for welding, and the groove gap is required to be small or no gap.

The advantages are that the current is large and the gap is small, so the production efficiency is high, and the operation skills are easy to master. The disadvantage is that if it is used for priming, the operator cannot see the blunt edge melting and the reverse side residual height, so it is easy to produce unfused and undesirable reverse forming.

The inner filler wire can only be used for root welding, which is to use the left thumb, index finger or middle finger to cooperate with the wire feeding action, the little finger and ring finger clamp the wire to control the direction, and the welding wire is close to the blunt edge on the inside of the groove, and melt together with the blunt edge for welding, requiring the groove gap to be greater than the diameter of the wire, and the wire can be bent into an arc if it is a plate.

2) Welding handle, divided into crank and mop.

The crank is to press the nozzle slightly on the weld, and shake the arm sharply to weld. Its advantage is that the welding nozzle is pressed on the weld, and the welding handle is very stable in the operation process, so the weld is well protected, the appearance is very beautiful, the product qualification rate is high, especially the welding is very convenient, and the color of the very beautiful appearance can be obtained when welding stainless steel. The disadvantage is that it is difficult to learn, and because the arm shakes widely, it is impossible to weld where there are obstacles.

The mop is the welding nozzle gently leaning on or not leaning on the weld, and the little finger or ring finger of the right hand is also leaning on or not leaning on the workpiece, and the arm swings small, dragging the welding handle for welding. Its advantage is that it is easy to learn and has good adaptability, but its disadvantage is that the forming and quality are not as good as the crank handle, especially the upward welding without the crank is convenient for welding, and it is difficult to get the ideal color and forming when welding stainless steel.

3) arc striking: arc striking device (high-frequency oscillator or high-frequency pulse generator) is generally used, tungsten electrode and weldment do not contact to ignite the arc, when there is no arc initiator, contact arc striking is used (mostly used for construction site installation, especially high-altitude installation), copper or graphite can be used to put the arc on the groove of the weldment, but this method is more troublesome, less used, generally with the welding wire Yufan lightly, so that the weldment and tungsten electrode are directly short-circuited and quickly disconnected and ignited the arc.

4) Welding: After the arc is ignited, it should be preheated at the place where the weldment starts for 3-5 seconds, and the wire feeding will start after the molten pool is formed. When welding, the angle of the welding wire and the welding gun should be appropriate, and the welding wire should be fed evenly.

The welding torch should move forward smoothly, swing left and right, be slightly slower on both sides and slightly faster in the middle. It is necessary to pay close attention to the changes in the molten pool, and when the molten pool becomes larger, the weld becomes wider or the welding current is concave early, the welding speed should be increased or the welding current should be re-adjusted. When the molten pool is not fused well and the wire feed has a feeling of not being sent, it is necessary to reduce the welding speed or increase the welding current, if it is a root weld, the attention of the eyes should be concentrated on the blunt edge of the groove, and the afterglow of the corner of the eye is on the opposite side of the seam, and pay attention to the change of the rest of the height.

5) Arc retraction: If the direct arc retraction is easy to produce shrinkage holes, if it is a welding torch with an arc initiator, the arc should be intermittently retracted or adjusted to the appropriate arc retraction current to slow arc retraction, if there is no arc reducer welding machine, the arc will be slowly led to the side of the groove, do not produce shrinkage holes, such as shrinkage holes should be polished clean before welding.

The wire feeding method is different in different situations.

If the current is large, the direct feeding method is used; In the current, the point wire feeding method is used; The current is small, and the wire is fed by the way.

Wire feeding is a very important operation link in the welding process, the wire feeding method of manual argon arc welding welding mostly adopts the welder's finger to twist the welding wire to complete the wire feeding process, and it is very inconvenient for the welder to operate the wire feeding, therefore, the accuracy of manual wire feeding is poor, the consistency is poor, and the wire feeding is unstable, so that the conductor cover causes the low production efficiency of the welding shield lifting, and the consistency of welding forming is poor.

Stainless steel welding wire or CO2 gas shielded welding wire, spot welding 70-80A, full welding 110-120A, wire walking speed.

The most commonly used iron-carbon alloy is carbon steel. Carbon steel is divided into: low carbon steel, medium carbon steel, and high carbon steel.

There are also steel types such as low-alloy steel, alloy steel, high-alloy steel, stainless steel, etc.

In the form of casting, there are many categories of cast iron (gray cast iron, white cast iron, inoculated cast iron, malleable cast iron, ductile iron, compacted graphite cast iron, etc.), cast steel, etc.

Only by knowing the specific steel type, details, grade and model, can the welding process parameters be reasonably formulated according to the base metal material. Before the material of the base metal was unknown, welding was not possible.

1. Fill welding

The angle between the filler electrode and the welding direction is 85 degrees to 90 degrees, and the welding current is between 100 and 120 amperes. During the filling welding, the welding slag of the previous welding should be carefully cleaned, and the continuous arc welding method should be adopted, and the welding should be carried out in two layers and three passes. The arc is triggered 10 to 15 mm from the end of the weld bead, and then the arc is pulled back to the beginning of the weld for welding, and the welding adopts a short arc zigzag or crescent-shaped transport bar.

When the welding rod swings to the groove on both sides, pause slightly, both sides are slow, the middle is fast, keep the molten pool into an ellipse, the weld bead is flat, and when welding the last filler layer weld bead, it is necessary to ensure that the groove edge is complete, and its height is 1 to 2 mm wide from the surface of the test plate

The angle between the cover welding electrode and the welding direction is 85 degrees to 90 degrees, the angle between the test plates on both sides is 90 degrees, the cover welding operation method is basically the same as the filling welding, when the welding rod swings to the edge of the groove, it is necessary to pause slightly, and the edge of the groove melts 1 to 2 mm, so as to prevent the undercut before the book, so that the surface of the weld is smooth.