Thursday, September 15, 2016

Welding Symbol

Dear Readers,

Wish You a Happy Engineer's Day-2016

During Construction at site, we are very often reading drawings and encountered the interpretation of welding symbol. Now let us discuss about welding symbols and special instructions.

Like other aspects of drafting, there’s a set of symbols for welding to simplify the communication between designer and builder (i.e. the site engineer / welder). This language may seem a little strange at first, so it's best to learn it one symbol at a time. These figures represent the core structure of every drafting specification for a weld to be performed. The welding symbol has an arrow, which points to the location on the drawing where a weld is required.

Welding Symbol having three lines. Out of three lines two is must and one is optional.
   1. Reference Line (Required Element)
   2. Arrow Line (Required Element)
   3. Tail (Optional Element)

Below mentioned sketch shows the lines, for better understanding purpose we indicated in different color.
Reference Line : It is always Horizontal Line, One end connected with Arrow line and another end connected with Tail.

Arrow Line : One end of arrow line connects to reference line and another end (Arrow side) points to a joint, which clearly identify the proposal of joint or Location or Weld area

Tail : It is a optional line and it is used to indicate the supplementary information to be used for welding or cutting or finishing process. Note that this tail may omitted when reference is not used.

Some of the drawing mentioned N/S or F/S or NS or FS. It means Near Side or Far Side. Near side means, Welding should be done where the arrow is shown. Far side means, Welding should be done another side or Opposite side of the arrow is shown.
Some of the special instruction, Drawing representation and welding symbols are as follows.
All in one like Welding symbol, drawing representation and special instruction, are mentioned in below sketch. Click on picture to enlarge.
For More Details about Welding Electrode Classification click Here
For More Details about Weld metal deposition click Here

Hope all readers are benefitted this article. Have a Nice Day

Sunday, September 4, 2016

SWL for Mechanically Spliced Slings

Dear Readers,

During Rigging operations in construction we must know the SWL (Safe Working Load) of Rope and Tackles used. Some times we have to fabricate the sling from wire rope and suitably spliced. Permissible Load Lifting Capacity of Individual Slings fibre-core and mechanically spliced. Diameter of wire rope is in Inches and SWL is in MT
Size of Rope  = SWL
1). 1/2 "   =  1.196 MT
2). 5/8" = 2.133 MT
3). 3/4" = 2.683 MT
4). 1 " = 4.783 MT
5). 1 1/4" = 8.50 MT
6). 1 1/2" = 10.75 MT
7). 1 5/8" = 13.266MT
8). 1 3/4" = 15.383MT

It is always advised to take a load test by competent person / authorized agency before commencement of spliced sling in to operation/ Erection.
For More Details about SWL Click Here
For More Details about Steel Wire Rope Click Here 
Best Quote :
To be Successful in life, Forget the problems that you faced.. But, don't forget the lessons that you learnt from those problems. Have a Nice Day

Sunday, August 21, 2016

Chinese Steel Standards

Dear Readers,

As you well aware due to globalization all works has been very competitive and it is helping us to exchange of knowledge and standards, in this scenario Chinese works are having more impact and competition throughout the world. Now it is very essential to know the Chinese standards and how it is indicated in drawings. Let us discuss how to identify and compare with our standards.
All Chinese standards are having prefix GB like IS for Indian Standard, JIS for Japanese. For Construction related works and other works different Chinese standards are followed, which are listed below.
GB = GuojiaBiaozhun ( National Standard in Chinese)
SY = Shi You (Petroleum)
JB = JianBiao (Construction Standard)
GB/T = T : Tuijian (recommended GB)
HG = HuaGong (PetroChemical)
Chinese standards for General structural steel (including chequred steel) is GB/T 700-2006. Grade of materials available is Q235 (A/B/C/D); Q275 (A/B/C/D).
Generally Chinese Steel Grades are Q195, Q215, Q235, Q255 and Q275 is used for Structural works. steel grades by the yield point of the letter on behalf of (Q) and yield point value is mentioned and sub grade A, B, C & D are used for further classification. For Example Q235A means, it is a carbon steel and having maximum yield strength of 235 Mpa.
For Steel section Channel is mentioned as "C"; Angles are mentioned as "L" and Beams are mentioned as “I “or “H " followed by number. To find out the size of section is number multiple by 10 is the size of member.
For Example C16 means Channel 160 mm depth. Similarly H10 means H section 100 mm depth.
If the same size but width or flange size is different then suffix a, b, c is shown. For example C20a & C20b, Both are 200 Channel however flange is 73 and 75 mm respectively. C20a means Channel 200 X 73 and C20b means Channel 200 X 75.
For More Details about European Steel Section Click Here
For More Details about Classification of Indian Steel Click Here
For More Details about Indian Standard for Rolled Steel Click Here
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Abbreviations (14) Acre (2) ANSI (1) Anti friction bearing (2) Apothecaries Mass (1) Avoirdupois Mass (1) AWG (4) AWS (1) BCR 295 (2) Beam (17) Bearings (5) Blasting & Painting (1) Bolt (4) CAR A/C (1) Cartoon (2) Cent (2) CHANNEL (5) Chequered Plate (1) Chinese (1) Civil (1) Classification (1) Cleaning (1) Cold Rolled Steel (2) Column Section (1) Computer (1) Construction Industry (2) Conversion Table (2) Crane Rail (2) Density (1) Drill bit (1) Drill gauge (1) Drilling (1) EHS (1) Ellipcon Steel (1) Elliptical Hollow Section (1) EN 10083-3 (1) EN 10219 (1) Engineer Day (5) Engineering Miracle (2) European Steel (3) Fibre Rope (3) Fire (1) FLAT (1) floating crane (1) Flood (1) GAUGE (9) General (17) Greetings (3) H-beam (4) Handrail (1) Heavy Weight Beam (1) Helmet (1) HEXAGOAN (1) Hollow Rectangle (3) Hollow Square (5) Hollow Steel (10) Hot rolled Steel (22) HSS (9) I-Beam (1) Information (3) Informations (3) Introduce (4) IPE (3) IS 1173 (5) IS 1786 (1) IS 3443 (2) IS 4923 (2) IS 808 (14) ISA (2) ISCR (1) ISHB (3) ISJB (4) ISJC (2) ISLB (3) ISLC (1) ISMB (3) ISMC (2) ISMCP (1) ISNT (2) ISSC (2) ISWB (3) JIS G3466 (1) Junior Beam (2) Junior Channel (2) Labour Law (1) Land Measurement (2) Light Beam (1) Light Channel (1) LPG Cylinder (1) Mass (2) Measurement (3) Metals (4) Mile Stone (2) Music Wire (4) MWG (6) Numbers (2) OCTOGAN (1) Painting (1) Parallel Flange Channel (1) PFC (1) PIPE (1) Plastics (2) PPE (1) Precautions (1) Rain (1) Rebar (1) Reinforcement Rod (1) Reinforcemnt Steel (1) Reo (1) Rigging (6) River on River (1) Rope (6) ROUND (1) Safety (9) Scale (1) Self Explanatory (4) SEP (4) Short cut key (1) Sling (1) Slit Tee (1) Specific Gravity (3) SQUARE (1) Steel (15) Steel Beam (6) Steel Section (5) Steel Section Type (4) Structural Steel (46) Surface Preparation (1) SWG (4) SWL (1) Technical (3) Tee Section (5) Thanks (5) Tools & Tackles (1) Torque (5) Troy Mass (1) TUBE (1) UB (2) UC (2) Unit of Mass (1) UNIT WEIGHT (41) Universal Beam (1) universal Column (2) Water (2) Weight (8) Welding (3) Wide Flange Beam (2) Wind (5) Wind Speed (3) Wire Rope (2) Wishes (9) WWD (1)


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