Stick welding requires you to select a correct welding electrode in order to ensure that your weld is both strong and free from cracks. Should you use an incorrect type of electrode for the metals that you are welding, the weld may either be brittle or crack shortly after the welding process are completed. In order to succesful perform stick welding, it is critical that you understand how each of the following factor can impact your welding process: the size of the welding electrode, the type of welding electrode, and the electrical polarity to be utilized during the welding process.
Each welding electrode contain a classification that is stamped onto the welding electrode. These classifications includes codes like E60xx and E70xx. These welding electrode classifications indicate the tensile strength of the welding electrode, as well as the type of flux that the welding electrode contains.
How to Choose the Right Electrode for Stick Welding
For instance, if the welding electrode contain cellulosic material, it will provide the weld with deep penetration; which may be necessary if the metal to be welded contain dirt or scale. Additionally, if the welding electrode use iron powder of a low-hydrogen composition, the weld will allow for the construction of thick metal joint without the risk of the joints crack. The size of the welding electrode should match the thickness of the metal to be welded.
Should you use an electrode that is too large for the thickness of the metal, your welding process will burn holes in that metal. Should you use an electrode that is too small for the metal that is to be welded, it is possible that the welding process will not provide enough heat to complete fuse the metals together. Additionally, the diameter of the welding electrode should match the amperage settings that is to be used with the welding machine.
If the amperage settings are too high for the thickness of the metal, excessive spatter may be create during the welding process, and the edges of the metal may melt excessively. If the amperage settings are too low for the metal to be welded, the welding electrode will fail to fuse the metals together. The polarity of the welding machine is also important in the stick welding process.
Most welding electrodes requires that the welding machine is set to Direct Current Electrode Positive (DCEP) settings, which will cause two-third of the heat from the welding process to be concentrated at the tip of the welding electrode. This allow for deep penetration of the welding metal into the metal to be welded. Some welding machines use Alternating Current (AC) settings, which is considered to be a stable setting for many field welding machine.
Regardless of the welding machine to be utilized, the selected welding polarity should match the specification of the welding electrode manufacturer. The position of the weld will impact in what way you utilize the welding electrode. Welding in a flat position is more easy than welding in other positions.
Welding in an overhead position will allow for more difficulty in the welding process. To counteract this, welding machines will require lower amperage settings when welding in an overhead position. All-position welding electrodes are manufactured in a way that they can be used in any position except for flat welding position.
Low-hydrogen welding electrodes must be stored in a specific way to ensure that the welds created by those welding electrodes does not crack. If moisture enters the welding electrode, it will introduce hydrogen into the weld, which will cause the weld to crack. To avoid this cracking, low-hydrogen welding rods should be stored in a welding rod oven to ensure that the welding rods remains dry.
Cellulosic welding electrodes does not require the same care as low-hydrogen welding rods, however. In order to create a high-quality stick weld, there is several procedures that should of been followed:
–Test the amperage settings on scrap metal prior to begin to weld the metal to be welded. -Clean the metal that is to be welded until it is brightly and clean.
–Place the ground clamp for the welding machine close to the weld to prevent weld blow. –Chip the slag that forms between weld passes to ensure slag does not become trapped within the weld.
