This standard specifies the names, definitions and corresponding English names of commonly used standard terms in welding (including soft and hard soldering and thermal cutting). This standard is applicable to the compilation of national standards, industry standards, enterprise standards, technical books, teaching materials, papers and reports. GB/T 3375-1994 Welding Terminology GB/T3375-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Subject Content and Scope of Application
Welding terminology
GB/T 3375- 94
Replaces GB3375-—82
This standard specifies the names, definitions and corresponding English names of the commonly used standard terms in the field of welding (including soft and hard soldering and thermal cutting). This standard is applicable to the compilation of national standards, industry standards, enterprise standards, technical books, teaching materials, papers and reports. 2 General terms
2.1 Welding
A method of joining workpieces by heating or pressurizing, or both, with or without filler materials. Welding technique
The ability of a hand welder or welding operator to execute welding process specifications. 2.3 Welding process
Refers to a specific welding method, such as submerged arc welding, gas shielded welding, etc., and its meaning includes the metallurgical, electrical, physical, chemical and mechanical principles involved in the method.
2.4 Welding procedure welding procedure The processing methods and implementation requirements related to the manufacture of weldments, including welding preparation, material selection, welding method selection, welding parameters, operating requirements, etc.
2.5 Welding procedure specification The detailed document of processing and practical requirements related to the manufacture of weldments, which can ensure the reproducibility of quality when operated by skilled welders or operators.
2.6 Welding operation welding operation
The general term for various actions to complete the welding process according to a given welding process. 2.7 Welding sequence welding sequence of each welding joint and weld on the workpiece. 2.8
Progress of welding The moving direction of the welding heat source along the length of the weld. 2.9
Welding circuit welding circuit
The welding current output by the welding power source flows through the conductive circuit of the workpiece. 2.10 Groove
A groove of a certain geometric shape is processed and assembled at the welded part of the weldment according to the design or process requirements. See Figure 1 for various groove forms.
Approved by the State Administration of Technical Supervision on June 20, 1994 68
Implemented on May 1, 1995
GB/T 3375--94
Groove form
1 shape (with gap
pad)
(with pad)
(with pad)
(with blunt edge)
(with blunt edge)
(with blunt edge)
Joint form
Butt joint
Butt joint
Butt joint
Butt joint
Butt joint
Butt joint
Butt joint
Butt joint
Butt joint
Butt joint
Butt joint| |tt||Butt joint
Butt joint
Butt joint
Welding seam form
Butt weld
Butt weld
Butt weld
Butt weld
(double-sided welding)
Butt weld
Butt weld
Butt weld
(with root pass)
Butt weld
Combined weld of butt weld and fillet weld
Butt weld
GB/T 337594
Groove form
Single-sided V-shaped
(with blunt edge)
Single-sided V-shaped
(with blunt edge, thick plate thinning)
Single-sided V-shaped
(with blunt edge)
Single-sided V-shaped
(with blunt edge)
Single-sided V-shaped
Continued Figure 1
Joint form
Butt joint
Butt joint
Butt joint Joint
Butt joint
Butt joint
T-joint
T-joint
T-joint
Welding seam form
Fillet weld
Butt weld
Butt weld
Combined weld of butt and fillet joint
Combined weld of butt and fillet joint
Butt weld
Fillet weld
Butt weld
GB/T 3375--94
Groove form
(with blunt edge)
Single-sided√ shape
Continued Figure 1
Joint form
T-joint
T-joint
T-joint
Cross joint
Cross joint
Lap joint
Plug weld lap
Slot weld joint
Weld form
Combined weld of butt and fillet joint
Butt weld
Butt weld
Fillet weld
Fillet weld
Plug weld
Slot weld
GB/T 3375--94
Groove form
Single-sided V-type
(with blunt edge)
Continued Figure 1
Joint form
Angle joint
Angle joint
Angle joint
End joint
Casing joint
Bevel butt joint
Weld form
Butt weld
Fillet weld
Fillet weld
Fillet weld
Fillet weld
Butt weld
GB/T 3375 --- 94
Groove form
(with blunt edge)
Double U-shape
(with blunt edge)
(with blunt edge)
Double J-shape
Trumpet shape
Continued Figure 1
Joint form
Crimp joint
Butt joint
Butt joint
T-joint
Butt joint
T-joint
Butt joint
Lock bottom joint
Weld form
Butt weld
Butt weld
Butt weld
Butt weld
Butt weld
2.11 Beveling (of the edge) GB/T 3375-94
Process of processing grooves by mechanical, flame or arc welding. 2.12
single groove
A groove that only forms a single-sided weld (including backing weld). 3double groove
A groove that forms a double-sided weld.
2.14 groove face
The groove surface on the welded part, see Figure 2.
2.15 groove angle
The angle between the two groove surfaces, see Figure 3.
2. 16 bevel angle, angle of preparationThe angle between the end face of the groove to be processed and the groove surface, see Figure 3. Root of joint
The part of the two parts of the joint that are closest to each other, see Figure 4. 2.18
Root opening
The gap reserved between the roots of the joint before welding, see Figure 3. 2.19 Root radius*groove radiusThe radius of the fillet at the bottom of the "-shaped" and U-shaped grooves, see Figure 3. 2.20 Root face
When the weldment is grooved, the straight edge of the end face along the root of the weldment joint groove, see Figure 3. 2.21 Joint
The joint that is composed of two or more parts to be welded or has been welded. When inspecting the joint performance, the mutual influence of different parts such as the weld, fusion zone, heat-affected zone and even the parent material should be considered. 2.22joint design
The joint form, groove form and size, weld size, etc. determined according to working conditions. 74
Groove angle
Root gap
GB/T3375—94
Groove surface angle
Twist angle
Groove surface angle
Root trace
2.23 Butt joint
Root trace
Root gap
Groove angle
Groove surface angle
Groove angle
Groove surface angle
Rough end
The joint where the two surfaces form an angle greater than or equal to 135° and less than or equal to 180°, see Figure 1. 2.24
Corner joint
The joint where the two ends form an angle greater than 30° and less than 135°, see Figure 1. T-joint
A joint in which the end face of one piece forms a right angle or a nearly right angle with the surface of another piece, see Figure 1. Lap joint
A joint formed by two pieces partially overlapping, see Figure 1. 2.27
Cruciform joint
A joint in which three pieces are assembled into a "cross" shape, see Figure 1. edge joint
GB/T 3375--94
An end joint formed by two overlapping pieces or with the angle between the two pieces not exceeding 30°, see Figure 1. 2.29 edge-flange joint A joint in which the ends of the pieces to be welded are pre-flanged and only partially melted after welding, see Figure 1. 2.30 sleeve joint
A joint formed by sleeveing ​​a short pipe with a slightly larger diameter over the ends of the two pipes to be connected, see Figure 1. 2.31 scarf joint
A butt joint in which the joint is arranged obliquely on the plane of the weldment, see Figure 1. lock joint
A joint formed by placing the end of one piece on the reserved bottom edge of another piece, see Figure 1. 2.33 base metal, parent metal A general term for the metal materials to be welded.
Heat-affected zoneheat-affected zone
A zone where the metallographic structure and mechanical properties of the material change due to the influence of heat (but not melting) during welding or cutting. 2.35
Overheated zone
A zone in the heat-affected zone of welding with overheated structure or significantly coarsened grains. 2.36Fusion zone (fusion welding) (no corresponding English standard term)The transition zone where the weld and the parent material meet, that is, the semi-molten zone of the parent material shown at the fusion line. 2.37
Fusion line (fusion welding)weld interfaceThe outline of the weld shown by macroscopic corrosion on the cross section of the welded joint. 2.38Weld
The joined part formed by welding of the weldment. Weld zoneweld zone
A general term for the weld and its adjacent areas.
2.40 Weld metal area The area of ​​weld metal measured on the cross section of the weld joint. In fusion welding, the area enclosed by the weld surface and the fusion line. In resistance welding, it refers to the nugget formed after welding. 2.41 Tack weld
A short weld welded before welding to assemble and fix the position of the component joint. 2.42
Strength weld
A weld used to bear the load on the weldment.
2.43 Continuous weld
A weld welded continuously.
2.44 Intermittent weld A weld welded with fixed intervals.
2.45 Longitudinal weld A weld distributed along the length of the weldment.
2.46 Transverse weld A weld perpendicular to the length of the weldment.
2.47 Girth weld, circumferential weld A closed weld that is connected end to end along a simple weldment. Spiral weld, helical weld 2.48
A weld obtained by welding a rolled sheet into a pipe joint in a spiral manner. 2.49 Seal weld
A weld mainly used to prevent fluid leakage. 2.50 Butt weld
GB/T 3375-94
A weld welded between the groove surfaces of a weldment or between the groove surface of one part and the surface of another part, see Figure 1. 2.51
Fillet weld
A weld welded along the intersection of two perpendicular or nearly perpendicular parts, see Figure 1. Fillet weld in normal shear Fillet weld in normal shear The weld axis is perpendicular to the direction of force on the weldment, see Figure 5. 2.53 Fillet weld in parallel shear The weld axis is parallel to the direction of force on the weldment, see Figure 6. Figure 5
2.54 Chain intermittent fillet weld
Chain intermittent fillet weldFigure 6
Intermittent fillet welds that are symmetrically arranged on both sides of the T-joint and have basically equal lengths, see Figure 7. Staggered intermittent fillet weldbZxz.net
Staggered intermittent fillet weld2.55
Intermittent fillet welds that are staggered on both sides of the T-joint and have basically equal lengths, see Figure 8. Figure 7
2.56 Convex fillet weld Convex fillet weld A fillet weld with a protrusion on the weld surface, see Figure 9. 2.57
Concave fillet weld A fillet weld with a concave surface, see Figure 10. Figure 8
Weld thickness
Weld leg size
GB/T 3375—94
Weld thickness
Weld leg size
Weld calculation thickness
2.58 Edge weld
The weld formed by the edge joint, see Figure 1.2.59 Plug weld
Weld calculation thickness~
Foot rule
Two parts overlap, one of which has a circular hole, and the weld formed by welding the two plates in the circular hole. Only the fillet weld in the hole is not called plug weld, see Figure 1.
2.60 Slot weld
Two plates overlap, one of which has a long hole, and the weld formed by welding the two plates in the long hole. Only the fillet weld is not called slot weld. Face of weld
The weld surface seen from the welded surface of the weldment after welding. 2.62 Root surface
The weld surface seen from the back of the welded surface of the weldment after welding. Weld width weldwidth
The distance between the two weld toes on the weld surface, see Figure 11. Weld throat
2.64 Actual throat
The distance from the weld face to the weld back in the weld cross section, see Figures 9 and 10. 2.65 Theoretical throat The weld thickness used when designing the weld. For butt welds, it is equal to the thickness of the weldment; for fillet welds, it is equal to the length of the perpendicular line from the vertex of the right angle to the hypotenuse in the largest right-angled isosceles triangle drawn in the cross section of the fillet weld, which is also customarily called the throat thickness, see Figures 9 and 10.
2.66 Convexity
GB/T 3375-94
The maximum distance between the weld toe line and the weld surface in the cross section of a convex fillet weld, see Figure 9. Concavity
The maximum distance between the weld toe line and the weld surface in the cross section of a concave fillet weld, see Figure 10. 2.68
Weld toe
The junction between the weld surface and the parent material, see Figure 11. 2.69 Fillet weld leg
The minimum distance from the weld toe on one right-angle surface to the surface of another right-angle surface in the cross section of a fillet weld, see Figures 9 and 10. 2.70
fillet weld size
The length of the right angle of the largest isosceles right triangle drawn in the cross section of the fillet weld, see Figure 10. Depth of fusion
The depth of fusion of the parent material or the preceding weld in the cross section of the welded joint, see Figure 12. Figure 12
2.72 Form factor (of the weld) In fusion welding, the ratio (B/H) of the weld width (B) to the calculated weld thickness (H) in the cross section of a single weld, see Figure 13. Xi
2.73 Weld reinforcement
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.