My grandchildren love watching me weld. They think it’s really cool to see all the sparks flying around and have many questions about why this happens. I know it’s related to the heat used to weld, but I wanted to give them a more precise answer, so I researched their question.
Sparks fly when metal is welded because of the intense heat it creates. Temperatures reach over 5,000 degrees Fahrenheit when welding. This high heat causes the metals used in the welding process to expel molten droplets (sparks).
Welding sparks may look like something out of a science fiction movie, but there is actually a lot of science behind this fascinating phenomenon. In this blog post, I take a closer look at what causes welding sparks and why they are an essential part of welding.
Why Does Welding Produce Sparks?
Where wood is chopped, splinters must fall. Where there is welding, sparks fly, the formation of which can be heard from afar. The “crackling and cracking” when welding creates tiny metal droplets that are ejected from the liquid-hot end of the electrode.
Some molten metal lands on the workpiece surface or the weld seam, and others fly around, filling the air with sparks.
Sparks can hardly be avoided when welding. Electrically charged particles migrate through the wire and the workpieces and lose energy along the way to heat the metal. Similar to striking a match, brief contact between the wire and the piece of metal is enough to set off a glowing arc of electrically charged particles.
The wire dissolves, and the molten metal splashes into the weld pool. Metal beads with a diameter of up to one millimeter are then sprayed out of the molten metal.
There are other possible causes for welding sparks. If, for example, the drop of molten metal lengthens when it falls, a continuous connection between the wire and the workpiece is created for a short time.
Then there is a short circuit. The arc goes out. The powerful current that now flows through the thin end of the drop heats it up enormously. Just before the drop completely detaches itself from the wire, the heat rises so much that it tears into many pieces.
Can You Stop Sparks When Welding?
There are several methods to stop or minimize the sparks, which need expertise in the selection of material used and handling the welding process. In fact, you can largely avoid spattering in an automated process, but this must be optimally coordinated.
It’s almost impossible with manual welding. In order to achieve this, the stick out must not change a millimeter during the entire process. The power source used must be able to compensate for short intervals as quickly as possible.
There is also a lot to consider when selecting the shielding gas because gas influences many factors: Penetration, droplet transfer, smoke formation, welding speed. Weld spatter is a side effect.
For example, the gases can influence the chemical properties and the viscosity of the melt, which always produces different results. Low viscosity, good droplet transfer, and welding with as few short circuits as possible ensure fewer weld spatters occur.
The wire should also be the focus when attempting to reduce welding spatter. On the one hand, it must be absolutely clean and must not bring any other particles into the weld pool.
But it is also essential that the wire material, wire thickness, feed speed, contact pressure of the wire feed rollers, the ratio of the gas composition, and much more are precisely matched if you want to avoid spatter.
Are Welding Sparks Hazardous?
Welding sparks can be very hazardous if not handled properly. They can cause burns, start fires, and even injure people. It is important to take precautions when welding sparks and know how to work with them safely.
Welding produces not only hot beads of sweat but also sparks. These sparks are dangerous since they can ignite fires even far from the welding point and are dangerous at worksites with gaps, cracks, or openings.
Flying sparks are also favored by other factors such as wind. However, sparks do not always immediately start a fire when they come into contact with other materials. The immediate danger for welders is body burns: sparks can fly into shoes or eyes and cause injuries there.
In fact, heat and sparks can measure a significant distance. Although not serious but very common, injuries to welders are burns because of sparks/spatter. They are also called “bow tattoos.”
What Happens if you Look at Welding Sparks?
An arc is the best-known symbol of welding, but behind the beauty of light and sparks, there is also danger. Welding sparks are the most dangerous aspects of welding because they draw attention to themselves.
With their intense ultraviolet light, the glow of sparks can cause cancer in unprotected eyes and skin. Looking into the arch with unprotected eyes can permanently damage your vision, and even a short exposure can cause burns to the surface of the eye, causing the so-called ‘Arc of the Eye’ or ‘‘Flash Burn.’’
Always wear an approved welding helmet designed for the process you’re using. I prefer welding helmets with the variable auto-darkening lens. There are some very good models that are reasonably priced. But don’t choose your helmet based on price.
What if a welding spark get in your eye?
Welding sparks can cause serious injuries if they get in your eyes. If this happens immediately seek medical attention, try to avoid rubbing your eyes. You can try to rinse your eyes, but do avoid applying pressure.
Ultraviolet and infrared radiation and visible elements such as hot splashes can damage the eyes and burn unprotected skin. If welding spatters reach the eyes, it can be even more dangerous, in which case the risk is to go blind.
Stay safe when welding by using the proper safety gear and taking precautions to avoid injuries. You should weld with an approved welding helmet, long sleeves, and heavy gloves.
What is the Temperature Range of the Arc?
To start welding and get it to your goals, starting with arc striking is essential. The heat resulting from arc welding is not only intense, but it is also very localized, which in the end, ends up being the ideal element for the welding operation itself.
The welding arc is super-hot. The temperatures of the arc vary depending upon the welding processes and also depend on the metals being welded. However, the core point of the welding arc is at a temperature between 3,500 and 15,500 degrees Celsius.
Can Welding Sparks Start a Fire?
No matter which welding method is used, there are always risks related to fire, smoke, and radiation. Fire hazards in welding processes are due to the high temperature required to melt and weld two pieces of metal and having flammable materials in the work area.
Sparks and weld spatter often travel 35 meters or more in the welding process. If these splashes hit something flammable like cardboard, oil, hydrogen gas, and others, it can cause a fire, and if it is not controlled in time, the losses and damages will be immense.
How Hot is a Welding Spark?
Sparks and metal particles released during welding can reach temperatures of up to 1,500 degrees Fahrenheit. This is hot enough to ignite most combustible materials.
What do you call the sparks from welding?
Sparks from a weld are called “spatter.” They are tiny incandescent molten metals that emit and fly through the air during the welding process.