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open root weld
when it involves pipe welding certifications albeit they will supply a backing bar, it really is not terribly common in the sector. in a few rare cases they'll use a chill ring or backing ring. with pipe it’s forever best to firmly go in the open root. as with all open root welds the within or back on your weld should have full penetration as if it were welded due to back aspect or within on your pipe. in the sector most welds done on pipe are open root groove welds.
open root welds are more durable to firmly do ! in case you are certifying with smaw presumably it will just be an e6010 root and an e7018 fill and cap. this can usually qualify you for a lot of welding electrodes then say a backing bar employing a e7018 electrode alone. another common combination to produce a open root pipe welding take a look at may be a gtaw root and hot pass by having smaw fill and cap. this is often thought of a combo style of take a look at since it certifies you in 2 welding processes.
welding certification processes
all welding certifications can be found in totally different method and procedures. one of the widely used welding processes are : stick welding properly generally known as shielded metal arc welding or smaw tig welding properly generally known as gas tungsten arc welding or gtaw mig welding properly generally known as gas metal arc welding or gmaw flux core arc welding or wirewheel welding
Welding Course Program on Peninsula College Students are a 2-year technical/community college that offers Small class sizes,Caring, dedicated, qualified instructors, Professional technical and academic transfer programs and Advisory Committee recommended equipment.
This Welding Course Program on Peninsula College leads to a Welding Technology Associate of Applied Science (AAS) degree to providing skills and related technical knowledge necessary for advancement in the metals/metal industry. Welding Course Program on Peninsula College provide classroom study/learning as well as extensive practice in the welding laboratory. Welding Course Program on Peninsula College also providing (WABO)Washington Association of Building Officials certification testing for candidate in an approved facility on the Peninsula College campus.
Welding Course Program on Peninsula College instructor/coordinator is a certified welding inspector and a certified welding educator through the (AWS)American Welding Society . Peninsula College is an approved WABO/Washington Association of Building Officials test facility and also offering welding certification examination course. Welding Course Program on Peninsula College contains two courses which are articulated through the Technology Prep program with one or more area high schools. Welding Course Program on Peninsula College contact information: Jeramie O’Dell 360-417-6541 jodell@pencol.edu
# Senior Certified Welding Inspector(SCWI) Do direct supervision to Certified Associate Welding Inspecto(CAWI) for perform inspections within visible and audible range, and as defined for the AWI as in AWS B5.1(Specification for the Qualification of Welding Inspectors).
# Senior Certified Welding Inspector(SCWI) have responsibility for certifying that welded assemblies conform to acceptance criteria and workmanship.
# Senior Certified Welding Inspector(SCWI) shall be able to certify the welder qualification to various codes and specifications
# The Senior Certified Welding Inspector(SCWI) shall be able to performing inspections or to verifying that the work inspected and records maintained, conform to the requirements of the applicable standards and perform all Welding Iinspector duties listed in AWS B5.1(Specification for the Qualification of Welding Inspectors).
# Senior Certified Welding Inspector(SCWI) shall be able to supervise one or more CWIs,CAWIs, and/or NDE personnel,perform inspections, review and interpret joining procedures,prepare inspection procedures, conduct audits of vendors and/or organizations provide materials or services to the project, and ensure that the records maintained and the work performed conform to the requirements of the
applicable standards and other contract documents and perform all SWI duties listed in AWS B5.1( Specification for the Qualification of Welding Inspectors).
Painting over welds is also a problem. The success of any paint film depends on its adherence to the base metal and the weld, which is influenced by surface deposits left on the weld and adjacent to it. The metallurgical factors of the weld bead and the smoothness of the weld are of minor importance with regard to the success of the paint.
Paint failure occurs when the weld and the immediate area are not properly cleaned prior to painting. Deterioration of the paint over the weld also seems to be dependent upon the amount of spatter present. Spatter on or adjacent to the weld leads to rusting of the base material under the paint. It seems that the paint does not completely adhere to spatter and some spatter does fall off in time, leaving bare metal spots in the paint coating.
(1) The success of the paint job can be insured by observing both preweld and postweld treatment. Preweld treatment found most effective is to use antispatter compounds, as well as cleaning the weld area, before welding. The antispatter compound extends the paint life because of the reduction of spatter. The anti- spatter compound must be compatible with the paint to be used.
(2) Postweld treatment for insuring paint film success consists of mechanical and chemical cleaning. Mechanical cleaning methods can consist of hand chipping and wire brushing, power wire brushing, or sand or grit blasting. Sand or grit blasting is the most effective mechanical cleaning method. If the weldment is furnace stress relieved and then grit blasted, it is prepared for painting. When sand or grit blasting cannot be used, power wire brushing is the next most effective method. In addition to mechanical cleaning, chemical bath washing is also recommended. Slag coverings on weld depsits must be thoroughly removed from the surface of the weld and from the adjacent base metal. Different types of coatings create more or less problems in their removal and also with respect to paint adherence.
Weld slag of many electrodes is alkaline in nature and for this reason must be neutralized to avoid chemical reactions with the paint, which will cause the paint to loosen and deteriorate. For this reason, the weld should be scrubbed with water, which will usually remove the residual coating slag and smoke film from the weld. If a small amount of phosphoric acid up to a 5% solution is used, it will be more effective in neutralizing and removing the slag. It must be followed by a water rinse. If water only is used, it is advisable to add small amounts of phosphate or chromate inhibitors to the water to avoid rusting, which might otherwise occur.
(3) It has been found that the method of applying paint is not an important factor in determining the life of the paint over welds. The type of paint employed must be suitable for coating metals and for the service intended.
(4) Successful paint jobs over welds can be obtained by observing the following: minimize weld spatter using a compatible anti-spatter compound; mechanically clean the weld and adjacent area; and wash the weld area with a neutralizing bath and rinse.
Note : Aluminum and aluminum alloys should not be cleaned with caustic soda or cleaners having a pH above 10, as they may react chemically. Other nonferrous metals should be investigated for reactivity prior to cleaning .
Welding Gloves TigFinger is made from smooth heat resistant material and Welding Gloves TigFinger lets you prop right next to the welding process as it slides along smoothly.
• Welding Gloves TigFinger can using on pipe welding with tig(tungsten inert gas welding) especially small bore stainless steel pipe.
• Welding Gloves TigFinger can using on tig(tungsten inert gas welding) welding aluminum castings that get really hot
• Welding Gloves TigFinger can using on Chromoly Tubing welds on cluster welding joints
• Welding Gloves TigFinger can using on Any time there is no place to prop and you have to rest your tig welding glove knuckles or pinky finger directly on the hot metal
• Welding Gloves TigFinger can using on tig(tungsten inert gas welding) aircraft parts of all types
• Welding Gloves TigFinger can using on tig(tungsten inert gas welding) Cast Iron that has been preheated because it needs to be welded at high temperatures.
image source: www.weldingtipsandtricks.com
• Welding Gloves TigFinger can using on aluminum pontoon boats
• Welding Gloves TigFinger can using on tig(tungsten inert gas welding) aluminum tuna towers
• Welding Gloves TigFinger can using on tig(tungsten inert gas welding) magnesium castings
• Welding Gloves TigFinger can using on tig(tungsten inert gas welding) food grade stainless kitchen welds
• Welding Gloves TigFinger can using on stainless headers
• Welding Gloves TigFinger can using on Tig(tungsten inert gas welding) Tubing,Titanium Ducts, or pipe
• Welding Gloves TigFinger can using on tig(tungsten inert gas welding) handrails
• Welding Gloves TigFinger can using on Stainless boat parts
• Welding Gloves TigFinger can using on The TigFinger heatsheild is even good for propping against the metal materials when you use a cutting torch
# The Hydrogen amount. The greater hydrogen volume more cause welding cracking
# The steel hardness. more harder steel more prone
# The welding joint stress level. more rigid the more easy to crack. Notches are stress raisers and intensify the effect.
Following step How to stop Hydrogen cracking:
# Reducing welding stress. Make sure to allowing the welding joint to move and eliminate welding stress raisers such as notches. Use preheat process to reduces stresses by reducing the thermal shock. More higher steel strength make increases rigidity and stresses.
# Make sure to using soft steel material like S275,S235, s355 ,50, 43, 55 series are soft and highly unlikely to crack.
# Make sure to using austenitic steel electrode/consumables (Stainless E312,E309, E307,E308Mo). austenitic steel electrode compositions have the ability to absorb the hydrogen within the steels structure.
image source: www.mig-welding.co.uk
# Make sure to allowing Hydrogen to diffusing out steel material. Keeping it warm, again do preheat will increasing the diffusion time. Allow it to cool slowly after welding process, then packing in sand. also make sure to using low hydrogen electrode/consumables.
# make sure to using high parameters or high heat input processes.
A typical spot welding machine, with its essential operating elements for manual operation. In these machines, the electrode jaws are extended in such a manner as to permit a weld to be made at a considerable distance f ran the edqe of the base metal sheet. The electrodes are composed of a copper alloy and are assembled in a manner by which considerable force or squeeze may be applied to the metal during the welding process.
There are several types of spot welding machines, including rocker arm, press, portable, and multiple type.
(a) Press type.
In this type of machine, the moveable welding head travels in a straight line in guide bearings or ways. Press type machines are classified according to their use and method of force application. They may be designed for spot welding, projection welding, or both. Force may be applied by air or hydraulic cylinders, or manually with small bench units.
(b) Rocker arm type.
These machines consist essentially of a cylindrical arm or extension of an arm which transmits the electrode force and in most cases, the welding current. They are readily adaptable for spot welding of most weldable metals. The travel path of the upper electrode is in an arc about the fulcrum of the upper arm. The electrodes must be positioned so that both are in the plane of the horn axes. Because of the radial motion of the upper electrode, these machines are not recommended for projection welding.
(c) Portable type. A typical portable spot welding machine consists of four basic units: a portable welding gun or tool; a welding transformer and, in some cases, a rectifier; an electrical contractor and sequence timer; and a cable and hose unit to carry power and cooling water between the transformer and welding gun. A typical portable welding gun consists of a frame, an air or hydraulic actuating cylinder, hand grips, and an initiating switch. The design of the gun is tailored to the needs of the assembly to be welded.
(d) Multiple spot welding type.
These are special-purpose machines designed to weld a specific assembly. They utilize a number of transformers. Force is applied directly to the electrode through a holder by an air or hydraulic cylinder. For most applications, the lower electrode is made of a piece of solid copper alloy with one or more electrode alloy inserts that contact the part to be welded. Equalizing guns are often used where standard electrodes are needed on both sides of the weld to obtain good heat balance, or where variations in parts will not permit consistent contact with a large, solid, lower electrode.
The same basic welding gun is used for the designs, but it is mounted on a special “C” frame similar to that for a portable spot welding gun. The entire assembly can move as electrode force is applied to the weld location. by online welding courses – non destructive testing
failure occurs when the weld and the immediate area are not properly cleaned prior to painting. Deterioration of the paint over the weld also seems to be dependent upon the amount of spatter present. Spatter on or adjacent to the weld leads to rusting of the base material under the paint. It seems that the paint does not completely adhere to spatter and some spatter does fall off in time, leaving bare metal spots in the paint coating.
