Thread Content
In CAD mechanical drawing, welding symbol notation is one of the very important CAD annotations. However, the welding symbol annotations in previous CAD software were mostly not very practical, causing engineers to spend a lot of time and effort when using them. Some new welding-related functions developed in Haocheng CAD mechanical software address the aforementioned issues. Next, I’ll share with you how to use these new functions! Guide to the use of welding symbol annotations: 1. In HaoChen CAD Mechanical software, weld annotations are based on the standards GB/T 324→1988 \"Code for representation of welds\" and GB/T 12212→1990 \"Dimensions, proportions, and simplified representation of weld symbols in technical drawings\". In the HaoChen CAD mechanical software, by selecting [HaoChen Mechanical (M)] → [Symbol Annotation (Y)] → [Welding Symbol (W)] or entering the command “HJ”, the “Welding Symbol” dialog box will appear, as shown in the figure below. Input: Basic welding symbols, weld dimensions, and other parameters. After setting the relevant parameters, click the “OK” button to switch to the drawing screen. Hint: Please select the annotation exit point. Input: Confirm the annotation exit point. Hint: Please select the next point. Input: Drag the mouse and click the left button to determine the position of the corner point. Input: Enter (or right-click the mouse). Hint: Please select the annotation location. Input: Drag the mouse and click the left button to determine the annotation location. Result: The annotation is completed. As shown in the figure below. 2. New welding symbols are supported, in accordance with the latest national standard GB/T324-2008 as well as the requirements for marking welding symbols in the actual work of certain enterprises. The following functions and operations are supported: Ÿ It complies with the latest national standard GB/T324-2008 ； Ÿ Improve preview effect ； Ÿ Feature dimensions can be added above or below the basic symbol ； Ÿ Support for input of dimensional tolerances in characteristic dimensions ； Ÿ Two lines of basic symbols can be marked on one side ； Ÿ The dashed-line switch is set as a button for easier switching. In the HaoChen CAD mechanical software, by selecting [HaoChen Mechanical (M)] → [Symbol Annotation (Y)] → [New Welding Symbol (G)], a “Welding Symbol” dialog box will appear, as shown in the figure below. ①Symmetric weld: 1) Initially select “Symmetric weld” to make the symbols below the line identical to those on the line. 2) Once “Symmetric Weld” is selected, regardless of whether basic symbols or supplementary symbols on or off the line are chosen, it is equivalent to selecting the symbols on both sides simultaneously. 3) Symmetric welds only affect the symbols, not the annotation information. That is: after selection, the content and position of the labeling information remain unchanged. 4) Due to special symbols, symmetric spot welds, seam welds, planar joint (braze) types, as well as the special properties of permanent and temporary gaskets, the “symmetric weld” concept does not apply to these symbols; that is, if the object of symmetry is one of these symbols, the weld mark on the other side will not be displayed (including the text description). ② Position reversal: When selected, the upper and lower positions of the welding symbol are swapped, including the symbol itself and its parameter descriptions. ③Symbols: Using symbol tools, we can easily annotate welding information, such as upper and lower deviation values. 1) : Upward and downward deviation. A stacking command similar to CAD. Even if the special symbol “^” is used to distinguish between the upper and lower deviations, to achieve the desired effect, enter “2+0.5^0”, select the characters following 2, and then press the upper/lower deviation button. The character height for upward and downward deviations is 0.714 times the normal character height. 2) °: degree. Used to insert an angle symbol. It has the same effect as entering “%%d” directly. 3) ±: Positive and negative signs. Used to insert a plus or minus sign. It has the same effect as entering “%%p” directly. 4) · : Dot. Used to insert a parameter separator “·”. 5) ×: Multiplication sign. Used to insert a parameter separator “×”. Symmetric welding and position switching, as shown in the figure below. 3. The welding notation is used to draw fillet welds and corner welds on ellipses, circles, arcs, lines, and polylines. Fillet welds and single-sided V-groove butt welds can be drawn in front views and side views. You can enter the weld width, or use fixed-point settings to define it. In the HaoChen CAD mechanical software, by selecting [HaoChen Mechanical (M)] → [Symbol Annotation (Y)] → [Welding Notation (L)], the “Welding Notation” dialog box will appear, as shown in the figure below. In this dialog box, you can select the welding representation to be placed on the geometry; by choosing the front view, the command line will display the following prompt: Leg width: Specify the width of the joint. Select a line, arc, circle, or ellipse: Specify the taper or slope to which the symbol should be attached. Start point: Specify the starting point of the joint. End point: Specify the ending point of the joint. Correct side: Specify whether the fillet weld should be placed on the correct side of the joint. If “No” is specified, the program will move the weld to the other side. Angle: Specify the angle of the weld. The resulting welding representation is shown in the figure below. The above is a tutorial on the use of welding symbols in CAD annotations; I hope it will be helpful to everyone~