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The weld was begun with the taps, but often the joint is weak and incomplete, so the smith will again heat the joint to welding temperature and work the weld with light blows to " set " the weld and finally to dress it to the shape.
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weld and was
There the simple open-air fane was held in common by the Latin tribes, which Rome aspired to weld into a league and direct.
Welded tuff is a pyroclastic rock, of any origin, that was sufficiently hot at the time of deposition to weld together.
The weld itself is called the fusion zone — more specifically, it is where the filler metal was laid during the welding process.
It was, however, reserved for the genius of Hammurabi to make Babylon his metropolis and weld together his vast empire by a uniform system of law.
The initial prototypes clearly showed a weld where the extension was attached.
The weld quality was said to be in no way inferior to that of Earth based welds.
At the Board Of Trade Inquiry into the accident doubts were expressed by expert witnesses about the design of the roof, even though the cause of the failure was attributed to a faulty weld in a tie rod.
Sarazen's innovation was to weld solder onto the lower back of the club, building up the flange so that it sat lower than the leading edge when soled.
This was traced to a small 6 mm fillet weld which joined a non-load-bearing flange plate to this D-6 bracing.
The improved SkV process was less sensitive and over the years weld quality improved.
In early November, 2010, a water leak caused by a faulty weld caused a " conservative " four-day shutdown while the pipe involved was repaired.
He was a statesman of considerable stature, able to weld the many conquered tribes into a strong, centralised kingdom.
This article was produced as an experimental test weld by a newcomer to welding.
Zinc plating was removed prior to the weld being done to avoid inhaling zinc fumes.
Along the way he showed considerable statesmanship, as he was able to weld his own people and the many tribes he conquered into a large and ethnically diverse but centralised kingdom.
In one scene, the original Batmobile appeared at the shop, and Jesse quipped " tryin ' to weld " when asked what he was doing.
Australia also built complete guns, choosing to weld the carriages rather than rivet, as was the practice in the UK and Canada.
If a manual spot weld, which was difficult to time, were held too long, heat would spread from the weld at a middling temperature that would weaken the stainless steel unacceptably ; Ragsdale's precisely-timed welds solved the problem.
" At that age, it was mostly sweeping the shop, but I started to play with the welder and soon I could make an arc and then weld.
:* From a consultant ( Fisher ) " The weld quality provided in the steel footing boxes for the connection of the steel piles to the pile sleeves was found to be very good.
The petrol filler was offset from the centerline of the tank to allow for a clean continuous seam weld.
weld and with
After a few hours and with no ' friendly ' ship sighted, the weld connecting the temporary coolant pipe to the reactor fails and the reactor temperature again begins to rise dangerously.
This is often done by melting the workpieces and adding a filler material to form a pool of molten material ( the weld pool ) that cools to become a strong joint, with pressure sometimes used in conjunction with heat, or by itself, to produce the weld.
Electric current is used to strike an arc between the base material and consumable electrode rod, which is made of steel and is covered with a flux that protects the weld area from oxidation and contamination by producing carbon dioxide ( CO < sub > 2 </ sub >) gas during the welding process.
The slag that forms on the weld generally comes off by itself, and combined with the use of a continuous wire feed, the weld deposition rate is high.
The cross-section of a welded butt joint, with the darkest gray representing the weld or fusion zone, the medium gray the heat-affected zone, and the lightest gray the base material.
Forge welding is more difficult to do with modern mild steel because it has a narrower band of temperature at which it will weld.
This creates a galvanic couple with the well-protected alloy nearby, which leads to weld decay ( corrosion of the grain boundaries in the heat affected zones ) in highly corrosive environments.
The process is used primarily to weld iron and steels ( including stainless steel ) but aluminium, nickel and copper alloys can also be welded with this method.
This activity, combined with chipping away the slag, reduces the amount of time that the welder can spend laying the weld, making SMAW one of the least efficient welding processes.
The most common quality problems associated with SMAW include weld spatter, porosity, poor fusion, shallow penetration, and cracking.
It can be caused by excessively high current, a long arc, or arc blow, a condition associated with direct current characterized by the electric arc being deflected away from the weld pool by magnetic forces.
Direct current with a negatively charged electrode ( DCEN ) causes heat to build up on the electrode, increasing the electrode melting rate and decreasing the depth of the weld.
For example, stainless steel electrodes are sometimes used to weld two pieces of carbon steel, and are often utilized to weld stainless steel workpieces with carbon steel workpieces.
Rutile electrodes, coated with 25 %– 45 % TiO < sub > 2 </ sub >, are characterized by ease of use and good appearance of the resulting weld.
weld and often
As its name implies, corrosion is limited to a very narrow zone adjacent to the weld, often only a few micrometers across, making it even less noticeable.
Projection welding is often used to weld studs, nuts, and other screw machine parts to metal plate.
Sloped, vertical or upside-down welding requires more operator skill, and often necessitates the use of an electrode that solidifies quickly to prevent the molten metal from flowing out of the weld pool.
Porosity, often not visible without the use of advanced nondestructive testing methods, is a serious concern because it can potentially weaken the weld.
Another defect affecting the strength of the weld is poor fusion, though it is often easily visible.
SMAW is often used to weld carbon steel, low and high alloy steel, stainless steel, cast iron, and ductile iron.
The durability and lifetime of dynamically loaded, welded steel structures are determined often by the welds, particular by the weld transitions.
This kind of corrosion is often termed weld decay.
Due to this the weld is often stronger than the individual metals.
It is fast and easily automated with weld times often below one second and there is no ventilation system required to remove heat or exhaust.
Multiple layers of foil or mesh can often be applied in a single weld eliminating steps and cost.
In the medical industry ultrasonic welding is often used because it does not introduce contaminants or degradation into the weld and the machines can be specialized for use in clean rooms.
In the fabrics industry, RF is most often used to weld PVC and polyurethane ( PU ) coated fabrics.
Some disadvantages are that this process can produce excessive, noxious smoke ( making it difficult to see the weld pool ); under some conditions it can produce welds with inferior mechanical properties ; the slag is often difficult and time-consuming to remove ; and operator skill can be a major factor.
Welders often develop a technique of rapidly alternating between moving the torch forward ( to advance the weld pool ) and adding filler metal.
As the weld nears completion, the arc current is often gradually reduced to allow the weld crater to solidify and prevent the formation of crater cracks at the end of the weld.
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