Two waytraffic sign

With over 33+ years experience, we've processed over 297,000 sign orders for name brand businesses in all industry sectors.

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The Type XI Diamond Grade Reflective is made from 3M Series 4000 and exceeds specification ASTM Type XI proposed. It delivers optimal performance at all sight distances, as well as all light and weather conditions. It overcomes declining illumination from newer headlights, provides the level of luminance needed by older drivers, and accommodates drivers of larger vehicles. The reflective sheeting has 12 year durability.

Alphabet Signs Inc, 91 Newport Rd, Suite 102, Gap, PA 17527 US Toll Free 800-582-6366, Fax 717-925-8323, Hours Weekdays 9:00am - 5:00pm EST

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Arc Shielding However, joining metals requires more than moving an electrode along a joint. Metals at high temperatures tend to react chemically with elements in the air - oxygen and nitrogen. When metal in the molten pool comes into contact with air, oxides and nitrides form which destroy the strength and toughness of the weld joint. Therefore, many arc-welding processes provide some means of covering the arc and the molten pool with a protective shield of gas, vapor, or slag. This is called arc shielding. This shielding prevents or minimizes contact of the molten metal with air. Shielding also may improve the weld. An example is a granular flux, which actually adds deoxidizers to the weld.

In welding, the arc not only provides the heat needed to melt the electrode and the base metal, but under certain conditions must also supply the means to transport the molten metal from the tip of the electrode to the work. Several mechanisms for metal transfer exist. Two (of many) examples include:

Arc welding may be done with direct current (DC) with the electrode either positive or negative or alternating current (AC). The choice of current and polarity depends on the process, the type of electrode, the arc atmosphere, and the metal being welded.

If an electrode is consumable, the tip melts under the heat of the arc and molten droplets are detached and transported to the work through the arc column. Any arc welding system in which the electrode is melted off to become part of the weld is described as metal-arc. In carbon or tungsten (TIG) welding there are no molten droplets to be forced across the gap and onto the work. Filler metal is melted into the joint from a separate rod or wire.

We offer signs in optional sizes. The size of the sign required is a function of speed and viewing distance. The faster a motorist is traveling then the further distance they will need to see the sign from. A larger sign can be read from a further distance. The MUTCD has correlated sign sizes by the type of road a motorist travels; Bike Path, Minimum, Standard, and Expressway.

More of the heat developed by the arc is transferred to the weld pool with consumable electrodes. This produces higher thermal efficiencies and narrower heat-affected zones.

Fig. 2 This shows how the coating on a coated (stick) electrode provides a gaseous shield around the arc and a slag covering on the hot weld deposit.

Basic Welding Circuit The basic arc-welding circuit is illustrated in Fig. 1. An AC or DC power source, fitted with whatever controls may be needed, is connected by a work cable to the workpiece and by a "hot" cable to an electrode holder of some type, which makes an electrical contact with the welding electrode.

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An arc is created across the gap when the energized circuit and the electrode tip touches the workpiece and is withdrawn, yet still with in close contact.

The Type I Engineer Grade Reflective is made from Nikkalite EG reflective sheeting. It exceeds ASTM D4956 Type 1 standards for retro reflectivity which is visible in daytime or nighttime from a wide range of angles. The reflective sheeting has 7 year durability.

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We also punch holes in the sign for easy mounting. The holes are 3/8 inch wide and are centered in the middle of the sign, top and bottom. These holes match standard sign posts.

Engineer grade prismatic or high intensity reflective signs on .080 aluminum. Buy dead end signs online and save!

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The arc produces a temperature of about 6500ºF at the tip. This heat melts both the base metal and the electrode, producing a pool of molten metal sometimes called a "crater." The crater solidifies behind the electrode as it is moved along the joint. The result is a fusion bond.

ASTM 3105 aluminum is environmentally friendly because of its high recycled content; 24.86% post consumer, 65.2% secondary content and only 9.89% virgin aluminum ingots. It can also be recycled for future use. Product life impacts the environment more than any other factor and this product is known for its reliability over competitor's products. This item is Made in America which reduces transportation costs, supply time and its environmental impact. Signs are recyclable and use recycled materials.

Arc welding is one of several fusion processes for joining metals. By applying intense heat, metal at the joint between two parts is melted and caused to intermix - directly, or more commonly, with an intermediate molten filler metal. Upon cooling and solidification, a metallurgical bond is created. Since the joining is an intermixture of metals, the final weldment potentially has the same strength properties as the metal of the parts. This is in sharp contrast to non-fusion processes of joining (i.e. soldering, brazing etc.) in which the mechanical and physical properties of the base materials cannot be duplicated at the joint.

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This item is Made in America which reduces transportation costs, supply time and its environmental impact and keeps American jobs.

The Type IV High Intensity Reflective is made from 3M Series 3930 and exceeds specification ASTM D 4956-04. It has a tougher topcoat that aids against scuffs and scratches. The vivid daytime colors provide 24 hour performance and the improved optical package increases nighttime visibility. The reflective sheeting has 10 year durability.

In arc welding, the intense heat needed to melt metal is produced by an electric arc. The arc is formed between the actual work and an electrode (stick or wire) that is manually or mechanically guided along the joint. The electrode can either be a rod with the purpose of simply carrying the current between the tip and the work. Or, it may be a specially prepared rod or wire that not only conducts the current but also melts and supplies filler metal to the joint. Most welding in the manufacture of steel products uses the second type of electrode.

We use ASTM 3105 sign grade aluminum alloy that is long lasting and rust free even in harsh weather extremes. The heavy gauge sign grade aluminum is .080 inches thick and is not easily vandalized or bent. The aluminum is cleaned and degreased to ASTM B-499 specifications as pretreatment for sheeting applications. A chromic acid conversion coating is applied for weather resistance and the edges are smoothed to prevent injury.

The arc itself is a very complex phenomenon. In-depth understanding of the physics of the arc is of little value to the welder, but some knowledge of its general characteristics can be useful.

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We manufacture the highest quality warning traffic signs made to the FHA guidelines (Federal Highway Administration) for traffic control devices. These W8-2 Dip Sign are professional sign grade aluminum, finished for long lasting performance and designed for easy detection, recognition, and legibility.

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This item ships UPS Ground to the continental US and once shipped, normally takes 2-5 business days to arrive in transit. UPS is one of the largest shipment and logistics companies in the world. UPS delivers more than 15 million packages a day to more than 6.1 million customers with exceptional real time tracking and notifications.

Nature of the Arc An arc is an electric current flowing between two electrodes through an ionized column of gas. A negatively charged cathode and a positively charged anode create the intense heat of the welding arc. Negative and positive ions are bounced off of each other in the plasma column at an accelerated rate.

All traffic signs must now be reflective, according to the Federal Highway Administration. The signs come in three grades of reflectivity (technically named retro reflectivity as a measure of reflecting light back to its source); Type I Engineer Grade, Type IV High Intensity Grade, and Type XI Diamond Grade. This product conforms to USDOT FHA standard specifications for construction of roads and bridges on federal highway projects, 1985 FP-85, Type II, Section 718.01. The reflective sheeting is chemical resistant and can withstand temperatures up to 160°F.

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Figure 2 illustrates the shielding of the welding arc and molten pool with a Stick electrode. The extruded covering on the filler metal rod, provides a shielding gas at the point of contact while the slag protects the fresh weld from the air.

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Winding Roadsign

Since there must be an ionized path to conduct electricity across a gap, the mere switching on of the welding current with an electrically cold electrode posed over it will not start the arc. The arc must be ignited. This is caused by either supplying an initial voltage high enough to cause a discharge or by touching the electrode to the work and then withdrawing it as the contact area becomes heated.

Shipping to AK and HI needs to be quoted and we will email you an invoice for the total cost before the order is processed. We are not set up for international shipments. We do not ship COD or bill to third parties.

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The stroke and spacing of the letter style for these W8-2 Dip Sign are also designed and field-tested for maximum readability and conform to the design requirements of the Federal Highway Administrations Manual on Uniform Traffic Control Devices.

Title 23 of the Code of Federal Regulations, Part 655.603 states that for the purpose of MUTCD applicability, the phrase "open to public travel" includes toll roads and roads within shopping centers, parking lots, airports, sports arenas, and other similar business and recreation facilities that are privately owned but where the public is allowed to travel without access restrictions.

This item comes with a limited manufacturer's guarantee on the reflective sheeting. Product life listed above is for normal use.

UPS offers the best value for medium size packages. UPS has been moving towards a dimensional weight pricing model where the shipping charges are calculated on the package weight, package dimensions and area delivered. The UPS shipping cost is calculated at check-out and adds to the cost of the order.

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