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Protective Welding
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Here are some more information for Protective Welding:
Welding stainless steel tubing boat rails can be a gravy job but can also be extremely challenging.
Boat owners can be very picky.
Welds not only need to be strong, but they need to look nice too. In fact many boat owners have come to expect welds on boat rails to be pretty much invisible.
And why not? Welds do not have to be ugly in order to be strong.
316 stainless steel is often used for marine hardware like boat rails and Stanchion feet fittings because 316 stainless steel is more corrosion resistant to salt water than most other grades of stainless like 304 for instance. But retaining the corrosion resistance all the way through the welding process requires some attention to detail. For welding stainless steel tubing for marine applications, follow these guidelines:
- always use a stainless steel wire brush that has never been used for anything else
- use the right filler metal - if the stainless tubing to be welded is 316L, then use 316L filler metal
- Pay attention to the fitup - a tight fit, with no gap results in a better joint
- back purge with argon or use a split sleeve backing ring
- use the right amperage - just enough to achieve desired penetration, but non enough to turn the metal gray
- for welds that will be subjected to salt air, a polish followed by a pickling paste helps increase corrosion resistance
In addition to the tips above, use a tig welding technique that lets you minimize heat input - like pulsing the current if your tig welding machine has pulse capability.
P.S. Some welders have found that a pulse setting of about 40 pulses per second, a percent time on of 30 percent, and a 30 percent background current is helpful in minimizing heat input.
Jody Collier's articles on subjects like Welding Stainless Tubing are full of Down and Dirty welding tips. For TIG, MIG, STICK welding along with a pantload of other welding information, visit http://www.weldingtipsandtricks.com/
How to build a metal welding table part one
safety first
1. Ventilation
It is important to use enough ventilation to keep the fumes and gases from your breathing zone. For occasional welding in a large room with good cross-ventilation, natural ventilation may be adequate if you keep your head out of the welding fumes. However, be aware that strong drafts directed at the welding arc may blow away the shielding gas and affect the quality of your weld. In planning your workshop ventilation, it is preferable to use ventilation that pulls fume from the work area rather than blows necessary shielding gas away.
2. Electric Shock
Remember, electric shock can kill. Wear dry, hole-free leather gloves when you weld. Never touch the electrode or work with bare hands when the welder is on. Be sure you are properly insulated from live electrical parts, such as the electrode and the welding table when the work clamp is attached. Be sure you and your work area stay dry; never weld when you/your clothing is wet. Be sure your welding equipment is turned off when not in use. Note that Lincoln wire feed / welders have a relatively low open circuit voltage and include an internal contactor that keeps the welding electrode electrically 'cold' until the gun trigger is pressed. These important safety features reduces your risk of electric shock during any welding project.
3. Arc Rays
It is essential that your eyes are protected from the welding arc. Infrared radiation has been known to cause retinal burning. Even brief unprotected exposure can cause eye burn known as welder's flash. Normally, welder's flash is temporary, but it can cause extreme discomfort. Prolonged exposure can lead to permanent injury.
4. Workspace - Protection from Sparks
Before you get started on any welding project, it is important that you make sure your work area is free of trash, sawdust, paint, aerosol cans and any other flammable materials. A minimum five-foot radius around the arc, free of flammable liquids or other materials, is recommended. Extra care should be taken in workshops that are primarily used for woodworking as sawdust can collect inside machines and in other hard to clean spaces. If a spark finds its way into one of these sawdust crannies, the results could be disastrous. If your shop area is too small to allow for a safe radius, please use an alternate area like a garage or driveway.
5. Gas Cylinders
Cylinders can explode if damaged. Always keep your shielding gas cylinder upright and secured. Never allow the welding electrode to touch the cylinder.
6. Safety Equipment
It is also imperative to make sure you have all the necessary safety equipment and that you're wearing welding friendly clothes. You should wear:
7. Welding gloves - dry and in good condition
Safety glasses with side shields
Protective welding shield with a dark lens shade appropriate for the type of welding you do
Head protection - like a fire retardant cotton or leather cap
Long-sleeve cotton shirt
Long cotton pants
Leather work boots
A fire extinguisher should also be on hand during any welding.
Also, make certain no children are in the area when you are welding. They may watch the arc and can experience retinal damage from its intense light. There is also a risk of a child getting burned by welding spatter.
About the Author
Goscor ARC, one of the leading suppliers of welding and cutting solutions in Southern Africa, distributes for both Lincoln Electric Company and ESAB, the two largest welding organisations in the world
what is flux used for in welding?
one of the following...:
To increase the temperature required for melting the metals to be joined.
To reduce the temperature for melting the metals to be joined.
To povide a protective coating on the weld metal when it cools to room temperature.
To provide a protective gaseous shield and dissolve oxides which form in the molten materials.
To enable the parts to be held together prior to welding.
Number 4.
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