In this article, concerned giving information on “surfacing weld” will be discussed. By the surfacing weld the properties such as friction, abrasion, and resistance are improved in a metal or alloy.
By the help of surfacing weld the properties of chemical and physical can be improved of a material. Surfacing weld is performed by spray or weld a filler metal which is coated to a matter. Corrosion is prevented of a matter by the surfacing welding.
What is a surfacing weld?
Surfacing weld is not expensive method it is economical to extending and conserving the life of construction equipment, tools and machines.
Surfacing weld can be explain as, a weld which is applied to a surface, like that prevents to a make a joint, for getting aimed dimensions or properties. Surfacing is a welding method which is used a wear resistant, hard covering of metal to borders or grounds of worn out sections.
In various industrial fields surfacing weld is widely used. The industrial fields are listed below,
- Farming industrial fields
- Coal industrial fields and Mining industrial fields
- Chemical sector industrial fields
- Manufacturing industrial fields
- Petrochemical industrial fields
- Shipbuilding industrial fields
- Structural industrial fields and construction industrial fields
- Shipyard industrial fields
Surfacing weld symbol:
The symbol of the surfacing weld should be clearly indicated to the area where the deposition of surface welding is happened.
The symbol of the surfacing weld is used to pointed,
- Cladding for corrosion resistance
- Hard facing with wear resistance material
- Build – up surfaces to required dimensions.
Thickness for the weld of the surface is indicated clearly by installing the dimension to the left flank of the symbol of the weld, the placed which is surfaced is pointed on the sketch.
Surfacing weld symbol can be determined with the help of some steps. The steps are listed below,
- Determine the classification of the joint and preparation of the joined is required
- Visualize the opening of the root
- Visualize the angle of the groove
- Visualize the radii of the root and also the face dimension of the root
- Visualize the thickness of the groove
- Visualize the size of the weld
- Visualize the contour finish
- Visualize the finishing process
- Visualize the edge of the joint
Determine the classification of the joint and preparation of the joined is required:-
The AWS A2.4:2007 is introduced by the American Welding Society they are published the symbol for the process of welding which contain different classifications of joints of groove which can be double or single. Single groove means joint by only one side and double groove means joint by both side. The symbols of the welding for the different types of joints of groove are listed below,
- Bevel groove
- V groove
- Scarf
- Square groove
- U groove
- J groove
- Flare V groove
- Flare bevel groove
Visualize the opening of the root:-
The opening of root will be indicating within the sign of the groove type. Root opening actually the amount of the detachment by the two pieces of the base metal. If detachment is not present showing that’s mean no space is present in by the parts. 0 is also admissible for the sign of the root opening.
Visualize the angle of the groove:-
The groove angle is expressed as degree. The angle of the groove can be present in the above section or the below section of the dimension of the root. The presences of groove angle depend upon the arrow.
Visualize the radii of the root and also the face dimension of the root:-
In the two ways, the radii of the root and also the face dimension of the root can be determined. The ways are listed below,
With the help of the drawing of cross section the dimension for the root opening is shown.
Need to note down the tail for the symbol of the welding process.
Visualize the thickness of the groove:-
The thickness of the preparation of the grooves is shown in the side of the left of groove weld symbol.
Visualize the size of the weld:-
In a groove weld, weld size is the effective throat. The weld size is included the penetration rate of the root of the groove and also the depth of the groove. The weld size will be display the left side of the symbol of the groove in parenthesis. If number is absent in the parenthesis then weld size not be lower than the depth of the groove.
Visualize the contour finish:-
The contour finish for the fillet weld can be classified in three categorized, such as,
- Flat contour finish
- Concave contour finish
- Convex contour finish
Visualize the finishing process:-
The symbol of the welding describes how much contour can be achieved. As a example, a flat contour by the grinding process the requirement is, AWS A2.4:2007 is introduced by the American Welding Society standard symbol for Brazing, Non-destructive investigation identified methods of finishing with 7th unspecified method,
- C – Chipping
- G – Grinding
- H – Hammering
- M – Machining
- P – Planishing
- R – Rolling
- U – Unspecified
Visualize the edge of the joint to be produce when the picture demands for a single bevel:-
In the case for the J groove, flare bevel and bevel symbol of welding inform us which side need to produce by having an arrow which is broken. When we observe the arrow which is already broken that’s mean the particular the side of the weld need to prepared.
Surfacing weld size:
The surfacing weld size can be estimated by the help of height of the weld from the substrate to the surface of the weld. The direction of the weld of surfacing welds is pointed in the tail of the symbol of the welding by the denominations of circumferential, axial, lateral, procedure of the welding and longitudinal.
Methods uses during the Surfacing weld joint:
The methods are uses during the Surfacing weld joint are listed below,
- Furnace fusing
- Plasma Arc Welding Surfacing
- Gas Metal Arc Welding Surfacing
- Gas Tungsten Arc Welding Surfacing
- Submerged Metal Arc Welding Surfacing
- Submerged Arc Welding Surfacing
- Oxy Acetylene Surface welding
- Flux Cored Arc Welding Surfacing
Image Credit – Wikipedia
Avoid things to prepare Surfacing weld design:
Thoughtless the method of cleaning, there are lots of vital things to avoid when the surface weld design is done. The things we have to avoid while prepare the design of surface welding,
- Leaving the marks or deep grooves
- Cutting excess amount of the plane of the workpiece
- During the wet metal welding is done
- Forget to wipe down the metal before starting
- Not properly handling the chemicals
Leaving the marks or deep grooves:-
When the marks or deep grooves are leave in that case the containments driven into the grooves and the process of surface welding became very difficult to perform.
Cutting excess amount of the plane of the workpiece:-
When surface welding perform with very thin metal or metal sheet in that case if excess amount of surface is cut down from the workpiece then the strength of the metal also the shape of the metal get effected.
During the wet metal welding is done:-
In the surface welding the methods which are widely used is, Tungsten Insert Gas Welding and Metal Insert Gas Welding. The welding method Tungsten Insert Gas Welding and Metal Insert Gas Welding always should to perform when the metal is completely dry.
Tungsten Insert Gas Welding and Metal Insert Gas Welding method never should to perform during the wet metal.
Forget to wipe down the metal before starting:-
In naked eye the metal can be looks like so clean but invisible impurities can be still present in the metal. So, before beginning the surface welding process the metal always should to wipe down to avoid type of disturbance.
Not properly handling the chemicals:-
In the surface welding process chemicals are use to run the process for avoiding any type of chemical reaction we should wear proper gloves, goggles and need to wash up solvents properly when it is done.
Frequent Asked Question:-
Question: – Describe about the different types of Surfacing in welding.
Answer:-The classification of Surfacing in welding are listed below,
- Hardfacing
- Buttering
- Buildup
- Weld Cladding
Hardfacing:-
By the help of hardfacing the properties for the base metals are improved. The properties which are improved are resistance, strength and durability. Hardfacing can be explaining as, a stronger material is credited to a workpiece.
Buttering:-
Buttering can be explaining as, a metal with dissimilar properties is credited to a workpiece.
As an example, in alloy of steel nickel alloy is credited
Buildup:-
When a base metal is added to a junction, prior weld or surface, this type of surfacing weld is known as buildup.
Weld Cladding:-
Weld Cladding can be explaining as, when corrosion resistant material is credited into the workpiece.
Conclusions:-
- The surfacing welding is dine in a base metal to protect from corrosion.
- The initial cost is lower comparative than the others welding methods.
- Maintained cost is also low.
- Skilled worker not needed to perform the surface welding.
Hi..I am Indrani Banerjee. I completed my bachelor’s degree in mechanical engineering. I am an enthusiastic person and I am a person who is positive about every aspect of life. I like to read Books and listen to music.