For many people who are new to hand welding or irregular hand welding, it is not easy to have a good weld and quality assurance. Here are five basic things you need to consider when performing manual arc welding to ensure weld quality: Set current, adjust arc length, adjust arc angle, adjust the welding speed.
Welding rods are a highly inefficient welding technique for cleaning the welding position, however, so do not ignore this step. Dust or dirt can be removed using a dedicated surface cleaner. The pliers must also be cleaned to ensure good contact, which will help stabilize the arc.
Welding posture must ensure that the welding pits are visible. Workers must choose the best view, avoid welding hands and eyes, and avoid toxic welding welding.
Five techniques for manual arc welding include: Current setting, adjusting arc length, adjusting arc angle, welding electrodes and adjusting welding speed. In order to meet the rules, welding workers need regular training, which can improve product quality as well as productivity.
1. ESTABLISHMENT OF ELECTRIC LINES
Depending on the type of electrodes to be used, the equipment must be set to positive, reversing or alternating current. Make sure you have the device set up properly before welding.
The size of the welding current depends on the welding rod diameter and the type of welding electrode you use. The manufacturer of the welding rod usually provides information on the line that matches the welding rod on the package. The welding currents can be adjusted as follows: 1Amp corresponding to 0.0254 mm welding rod diameter. You can let the current flow low, then adjust up 5 to 10 Amp and then consider the welding ability accordingly.
2. LONG-TERM ADJUSTMENT
Arc length depends on the type of welding rod, welding position. Basic welding arc length should not exceed the welding rod diameter. When the arc length is too short can cause unstable arc, can turn off the arc, welding hardened faster and create high welding scales. Too much caustics will cause splashes, slow deposition rates and porosity.
Note: For newcomers to welding is often too long arc, because they want to observe the arc and puddle, but should change the welding position to be able to see the arc and potting better, no. should prolong the arc. A little practice you will be able to ensure that there is less low splice splash.
3. TURNED ITEMS
For surface welding, the welding rod angle should be from 5 to 15 degrees in the direction of motion, for arc welding the vertical position should be to angle the welding rod from 0-15 degrees in the opposite direction of welding rod.
Movement along the weld shaft maintains and adjusts the arc length. Horizontal movement maintains the width of the weld. There are many types of movement: horizontal, continuous and intermittent motion depending on the thickness of the weld. With thin welds there is no need for horizontal movement of the weld rod because the arc width is sufficient to fill the weld groove. With welded stand should pay attention welding from the bottom up with thick plates and welded from the top with thin plates (pay attention to welding edge).
5. ADJUSTMENT OF WELDING SPEED
Welding speed should ensure that arc welding takes 1/3 of the length of the welding puddle. Too slow welding will produce fluxed and non-porous scales. Arc lost heat can not molten solder.
The speed of welding too fast reduces the penetration of welds, uneven welding flakes and does not fill the welding pool.