Welding Stainless Steel – Mobile Stainless Steel Welder
JW Portable Welding & Repairs is a designated stainless steel welder in Ontario for many companies. We offer solutions to stainless steel equipment's problems such as leaks, cracks, and pitting. Re-fabrication of stainless steel equipment is our specialty.
We we weld different stainless steel alloys in different thicknesses with following techniques:
- SMAW (Stick) welding stainless steel,
- GTAW (Tig) welding stainless steel and
- GMAW (Mig)welding stainless steel.
So far, we have welded stainless steel in construction industry and in restaurants. We have used "stick" welding technique for welding stainless steel well liners in construction of new wells. And in restaurants, we have used "Tig" and "Mig" welding stainless steel.
"Stick" stainless steel welder
Stick welding stainless steel is the only choice in many construction projects that involve welding stainless steel in the open air. The tent setup would allow for preferable heavy "Mig" stainless steel welding. But in many situations the tent setup is impractical or simply impossible. The only option left welding stainless steel is "Stick" technique.
Preheating process is crucial prior stainless steel welder strikes an arc and it must be done thoroughly. Even in areas at some distance from the welding spot preheating must eliminate moisture. The temperature must reach certain level that will not allow this moisture to come back during the welding process on large elements.
The unfinished welds could cool down and then be exposed to the coming moisture. The moisture accumulation on unfinished welds will prohibit finishing them properly. That is why planning the welding pattern according to the welding's heat distribution is very important. The stainless steel welder must follow this pattern in order to increase efficiency. That is why the continues monitoring of the welded piece’s temperature is very important for the overall stainless steel welding success.
A working portable oven for stainless welding rods is necessary since it keeps them dry. I would not remove more than 2 – 3 welding rods from the oven in high humidity weather conditions.
Root penetration when "Stick" welding stainless steel
Welding stainless steel pipes according to TSSA procedure recommends "Tig" welding stainless steel that provides strong root penetration. When we must weld stainless steel structural elements or stainless-steel well liners the "Tig" welding stainless steel for root penetration is not within the budget.
The first welding pass done with "Stick" is always a little challenging for every stainless steel welder due to slightly open root. In such circumstances the following conditions impact the quality of stainless steel welding:
- preheating temperature,
- amperage setup on the machine,
- speed of moving along the groove and
- angle how you run the rod
These factors make the difference between a clean weld and a weld with embedded slug.
Embedded slug is difficult to remove and removal of embedded slug decreases the welder's efficiency. Remember, nobody wants to keep removing the embedded slug from the groove since it takes all the fun from the whole day. That is why preparation is the key for any stainless steel welder's success. Needless to say, if you are attempting to do a root penetration with 1/8 stainless steel rod, you are probably setting yourself for a failure.
The experience plays a major role here. The first weld even after preheating must be done on the hot side. Then removal of slug with a stainless-steel wire wheel or a grinding wheel is absolutely necessary. The question is if you can really provide a complete root penetration with stick welding stainless steel in the absence of stainless-steel penetrating rod and without using "Tig"? The answer is that you will never achieve the quality of penetration comparable to "Tig", but experienced stainless steel welders achieve consistent penetration without loosing much of weld’s strength.
Experienced welders pay also attention to the spread of the V shaped groove. The more spread you get when "Stick" welding stainless steel than is easier. The J shape grooves are much more difficult to do.
Warpage when welding stainless steel
Warpage of thick stainless-steel elements is a factor when welding thick elements and overheating of the one spot will cause warpage. Properly positioned tacking and than continues rotation of welded spots with temperature monitoring allows to minimize the problem. Taking a break allows the piece to cool down, therefore taking breaks when welding complicated, multi-element stainless steel structures is a good idea. Rushing when "Stick" welding stainless steel is generally a very bad idea that leads to failures.
Vertical welds accentuate stainless steel welder skills
The amperage control is absolutely necessary when doing vertical welds when "Stick" welding stainless steel. The stainless steel welder must have a welding machine at a very close distance or he must have an amperage regulator on him. The amperage difference of about 3A makes a difference when welding vertical welds with stainless steel rod. In longer vertical welds the scattering technique would help to control temperature but even then, the reduction of amperage at the end of a long vertical stainless-steel weld is necessary to avoid formation of so called “grapes”. Welder must stay very focused when welding vertical welds therefore any distractions are definitely not helping.
"Tig" stainless steel welder – stainless steel welding in Ontario's restaurants
We offer (Tig) welding stainless steel in the portable setup therefore we must connect our stainless-steel welder to at least 110v 20A or 30A. Preferably we would like to connect to 220V single faze for more power if necessary. We have more common plugs in the industry and therefore we can accommodate to variety of reciprocators available in many restaurants.
The "Tig" welding stainless steel in restaurants is a very popular welding service and we travel up to Toronto doing these complicated welds. When using "Tig" welding stainless, all the vertical welds are fairly easy to do and the control that "Tig" technique has allows to weld stainless sheet metal without any problem.
The only restriction is the access to the welding spot. Additionally, it is a well know fact that "Tig" stainless steel welds are flexible therefore it is a preferable technique when repairing cracked stainless-steel parts or welding in parts that are exposed to vibration. With "Tig" welding stainless steel the stress line has much more difficulty to be formed and the vibration is spread on much bigger surface.
Mig welding stainless steel – welding stainless steel sinks
We offer "Mig" welding stainless steel in the portable setup therefore we have to connect to 220 single faze in order to provide this welding service. A welding machine setup that takes into consideration the thickness of the wire and the thickness of the material being welded takes place prior welding.
We travel up to Toronto with our Mig welding stainless steel when a seal weld is needed. In most cases we weld repair leaking stainless steel sinks. We weld partitions in the sink that have never been welded properly. Recently, we have received many orders for welding cracks on stainless steel sinks that has formed on top of the damaged sink. Occasionally, we also weld exhaust sheet stainless steel with our seal weld using "Mig".